ORACLE 資料塊格式深入解析

Davis_itpub發表於2018-06-27
Oracle
<div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <span style="background-color:inherit;line-height:1.5;">Data Block是資料庫中最小的I/O單元，下面我來簡單介紹下資料塊的基本結構。&nbsp;</span> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 一、建表空間 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;create tablespace tp1 datafile '/oradata/bxocp/tp01.dbf' size 10M; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 二、建使用者及授權 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;create user gyj identified by gyj default tablespace tp1; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;grant dba to gyj; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 三、建表 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;conn gyj/gyj </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;create table t1 (id int,name varchar2(100)); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 四、插入一行資料 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;insert into t1 values(1,'AAAAA'); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 五、手動發生一個檢查點，使上面一行資料寫到資料檔案 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> alter system checkpoint; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 六、查這行資料所在的檔案號和塊號 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;col name for a10 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt;select &nbsp;id,name,dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) block# from t1; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; ID &nbsp; &nbsp; &nbsp; NAME &nbsp; &nbsp; &nbsp; &nbsp;FILE# &nbsp; &nbsp; BLOCK# </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;---------- &nbsp; --------- &nbsp; &nbsp; &nbsp; ---------- &nbsp; &nbsp;---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1 &nbsp; &nbsp; &nbsp;AAAAA &nbsp; &nbsp; &nbsp; &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp;135 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 七、轉儲6號檔案135號塊，新開個視窗 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@guoyj ~]$ sqlplus / as sysdba </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; alter system dump datafile 6 block 135; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 八、找到轉儲的檔案 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; show parameter dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> NAME &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TYPE &nbsp; &nbsp; &nbsp; &nbsp;VALUE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------------ ----------- ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> background_core_dump &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;partial </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> background_dump_dest &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;/u01/app/oracle/diag/rdbms/bxo </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;cp/bxocp/trace </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 再開一新視窗 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@guoyj ~]$ cd &nbsp;/u01/app/oracle/diag/rdbms/bxocp/bxocp/trace </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@guoyj trace]$ ls -lFtr </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 下面這個跟蹤日誌就是6號檔案135號塊轉儲出來的資料塊資訊 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> -rw-r----- 1 oracle oinstall &nbsp; 3363 Dec 11 18:02 bxocp_ora_5429.trc - </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 九、分析資料塊結構 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@guoyj trace]$ vi bxocp_ora_5429.trc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Trace file /u01/app/oracle/diag/rdbms/bxocp/bxocp/trace/bxocp_ora_5429.trc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> With the Partitioning, OLAP, Data Mining and Real Application Testing options </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ORACLE_HOME = /u01/app/oracle/product/11.2.0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System name: &nbsp; &nbsp;Linux </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Node name: &nbsp; &nbsp; &nbsp;guoyj </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Release: &nbsp; &nbsp; &nbsp; &nbsp;2.6.18-128.el5 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Version: &nbsp; &nbsp; &nbsp; &nbsp;#1 SMP Wed Dec 17 11:41:38 EST 2008 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Machine: &nbsp; &nbsp; &nbsp; &nbsp;x86_64 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> VM name: &nbsp; &nbsp; &nbsp; &nbsp;VMWare Version: 6 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Instance name: bxocp </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Redo thread mounted by this instance: 1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Oracle process number: 28 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Unix process pid: 5429, image: oracle@guoyj (TNS V1-V3) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** SESSION ID:(29.15) 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** CLIENT ID:() 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** SERVICE NAME:(SYS$USERS) 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** MODULE NAME:(sqlplus@guoyj (TNS V1-V3)) 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> *** ACTION NAME:() 2012-12-11 18:02:31.307 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Start dump data blocks tsn: 7 file#:6 minblk 135 maxblk 135 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Block dump from cache: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Dump of buffer cache at level 4 for tsn=7 rdba=25165959 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> BH (0x7f3f6958) file#: 6 rdba: 0x01800087 (6/135) class: 1 ba: 0x7f33a000 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; set: 3 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 103,28 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; dbwrid: 0 obj: 76987 objn: 76987 tsn: 7 afn: 6 hint: f </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; hash: [0x908b5100,0x908b5100] lru: [0x7f3f6910,0x7f3f6b70] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; ckptq: [NULL] fileq: [NULL] objq: [0x7f3f6938,0x8d148e00] objaq: [0x7f3f6948,0x8d148df0] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; st: XCURRENT md: NULL fpin: 'ktspbwh2: ktspfmdb' tch: 3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; flags: block_written_once redo_since_read </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [1] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Block dump from disk: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1、資料塊頭部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> buffer tsn: 7 rdba: 0x01800087 (6/135) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> scn: 0x0000.0015a3eb seq: 0x01 flg: 0x06 tail: 0xa3eb0601frmt: 0x02 chkval: 0xec19 type: 0x06=trans data </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flg：0x01 (新建塊)0x2(資料塊延遲清洗推進scn和seq) 0X04(設定校驗和) 0x08(臨時塊) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> type：0x06(表/索引塊) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frmt: &nbsp;0x01(v7) &nbsp;0x02(v8) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Hex dump of block: st=0, typ_found=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Dump of memory from 0x00002B70E9566A00 to 0x00002B70E9568A00 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A00 0000A206 01800087 0015A3EB 06010000 &nbsp;[................] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A10 0000EC19 00000001 00012CBB 0015A3EA &nbsp;[.........,......] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A20 00000000 0032F802 01800080 000F0004 &nbsp;[......2.........] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A30 00000346 00C00793 002200BB 00002001 &nbsp;[F.........".. ..] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A40 0015A3EB 00000000 00000000 00000000 &nbsp;[................] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A50 00000000 00000000 00000000 00000000 &nbsp;[................] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A60 00000000 00010100 0014FFFF 1F781F8C &nbsp;[..............x.] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A70 00001F78 1F8C0001 00000000 00000000 &nbsp;[x...............] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E9566A80 00000000 00000000 00000000 00000000 &nbsp;[................] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; Repeat 502 times </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2B70E95689F0 0202012C 410502C1 41414141 A3EB0601 &nbsp;[,......AAAAA....] </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2.ITL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Block header dump: &nbsp;0x01800087 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Object id on Block? Y </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12cbb &nbsp;csc: 0x00.15a3ea &nbsp;itc: 2 &nbsp;flg: E &nbsp;typ: 1 - DATA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;brn: 0 &nbsp;bdba: 0x1800080 ver: 0x01 opc: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;inc: 0 &nbsp;exflg: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12cbb --16進位制轉成10進位制76987 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select object_id from dba_objects where object_name='T1' and owner='GYJ'; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> OBJECT_ID </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;76987 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> csc: 0x00.15a3ea --cleanoutSCN,塊清除時的SCN </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> itc: 2 &nbsp; --ITL槽的數量 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flg: E &nbsp; --指用的是ASSM，如果是O表示用的是free list </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> typ: 1 - DATA &nbsp; --事務型的資料塊（並且：資料塊頭的type：0x06），存放表和索引資料。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Uba &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; &nbsp;Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp;0x0004.00f.00000346 0x00c00793.00bb.22 --U- &nbsp; &nbsp;1 &nbsp; fsc 0x0000.0015a3eb </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp;0x0000.000.00000000 0x00000000.0000.00 ---- &nbsp; &nbsp;0 &nbsp; fsc 0x0000.00000000 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl: ITL事務槽號的流水編號 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Xid：transac[X]tion identified(事務ID),由und的段號+undo的槽號+undo槽號的覆蓋次數三部分組成 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Uba：undo block address記錄了最近一次的該記錄的前映象（修改前的值） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Flag：C是提交，U是快速提交，---是未提交 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Lck：鎖住了幾行資料，對應有幾個行鎖 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Scn/Fsc：Scn=SCN of commited TX; Fsc=Free space credit(bytes) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這裡fsc 0x0000.0015a3eb是指提交的scn，這個值大於上次清除塊時的scn=csc: 0x00.15a3ea(此scn是這個塊中最小的SCN of commited) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SCN WRAP:如果事務已提交併完成清洗，該欄位儲存事務提交SCN的SCN WRAP部分，否則該欄位儲存空閒預支位元組數(FSC).比如我刪除了一行資料10個位元組，在事務提前前，這10個位元組就屬於fsc（即會寫到SCN WRAP），只有事務提交後，才能正式返回到空閒空間。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 3.使用者資料頭 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;bdba: 0x01800087 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> data_block_dump,data header at 0x2b70e9566a64 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> =============== </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tsiz: 0x1f98 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> hsiz: 0x14 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> pbl: 0x2b70e9566a64 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;76543210 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x14 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f78 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f78 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp;nrow=1 &nbsp;offs=0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; offs=0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> bdba: 0x01800087 &nbsp;-- 資料塊的地址：16進位制轉成2進製取前10位二進位制為檔案號0000 0001 1000 ..... &nbsp;0000000110=5號檔案，後面剩於的部分表示塊號，0X87轉成10進製為135號塊 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tsiz: 0x1f98 &nbsp;--top of size 塊的總大小即8088個位元組 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> hsiz: 0x14 &nbsp; --Data header size 資料頭大小即20個位元組 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> pbl: 0x2b70e9566a64 --Pointer to buffer holding the block </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; 76543210 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- &nbsp;N=pcrfree hit(clusters);F=do not put on free list;K=flushable cluster keys </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 &nbsp; &nbsp; --叫表數：表示這個塊的資料在一個表(如果是聚簇表就有可能是2或2以上) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=1 &nbsp; &nbsp; --叫行數：表示這個表有一行資料 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 &nbsp; &nbsp; &nbsp;-- The first free row entry in the row directory＝you have to add one </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x14 &nbsp; -- Free space begin offset &nbsp;叫起始空間：可以存放資料空間的起始位置（即定義了資料層中空閒空間的起始offset） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f8c &nbsp;-- Free space end offset &nbsp;叫結束空間：可以存放資料空間的結束位置（即定義了資料層中空閒空間的結束offset） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f78 &nbsp;--Available space for new entries &nbsp;叫空閒空間：定義了資料層中空閒空間的位元組數 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f78 &nbsp;--Total space &nbsp; 叫最終空閒空間：定義了ITL中事務提交後，資料層中空閒空間的位元組數 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp;nrow=1 &nbsp;offs=0 &nbsp;--Table directory,整個表的開始，共一行資料 ，定義了該表在行索引中使用的插槽數 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; offs=0x1f8c &nbsp; &nbsp; &nbsp;--Row index，叫行索引，定義了該塊中包含的所有行資料的位置 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 4.使用者資料 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;block_row_dump: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x1 &nbsp;cc: 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;41 41 41 41 41 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> end_of_block_dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> End dump data blocks tsn: 7 file#: 6 minblk 135 maxblk 135 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f8c &nbsp; &nbsp; &nbsp;--第一個表第一行的位置 ，定義了該表在行索引中的起始插槽號 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x1 &nbsp;cc: 2 &nbsp;--行頭，tl: 12行長度12個位元組， </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fb: (Flag byte)--H-FL指H（Head piece of row）F(First data piece) L(Last data piece) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> lb: 0x1 --Lock byte和上面的ITL的lck相對應，表示這行是否被lock了 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> cc: 2 --表示有兩列，即這個表有兩個欄位 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 --第一行的第一個欄位長度和值 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;41 41 41 41 41 --第一行的第二個欄位長度和值 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料塊的最後四位元組tail: 0xa3eb0601＝scnBASE+flg+seq,如果不相等會報塊損壞！！！ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 5、下面對這些資料用SQL語句做相互轉換 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> （1）把表中的資料轉成16進位制（即在ORACLE內部資料塊看到的資料），用以下sql語句： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; gyj@OCM&gt; select id,name,dump(01,'16'), dump('AAAAA','16') &nbsp;from t1; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; ID NAME &nbsp; &nbsp; &nbsp; DUMP(01,'16') &nbsp; &nbsp; DUMP('AAAAA','16') </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---- ---------- ----------------- ---------------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;1 AAAAA &nbsp; &nbsp; &nbsp;Typ=2 Len=2: c1,2 Typ=96 Len=5: 41,41,41,41,41 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> （2）反過來把16進位制轉成表中的資料（當然我這邊的資料型別只考慮了number和varchar型別），用以sql下語句： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ggyj@OCM&gt; col id for 999gyj@OCM&gt; col id1 for 999 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; col name for a10 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; col name1 for a10 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; select id,UTL_RAW.CAST_TO_NUMBER(replace(' c1 02 ',' ')) id1, </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 2 &nbsp;name,UTL_RAW.CAST_TO_VARCHAR2(replace('41 41 41 41 41',' ')) name1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 3 &nbsp;from t1; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; ID &nbsp;ID1 NAME &nbsp; &nbsp; &nbsp; NAME1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---- ---- ---------- ---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;1 &nbsp; &nbsp;1 AAAAA &nbsp; &nbsp; &nbsp;AAAAA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> **************************************************************************************************************************************************************************** </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 一、對於我上面講的： 1、資料塊頭部分中講的flg標誌再做一些詳細的補充 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp; (新建塊) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x2 &nbsp; (資料塊延遲清洗推進scn和seq) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0X04 &nbsp;(設定校驗和) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x08 &nbsp;(臨時塊) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 對於 flg標誌的值是由上面一些位做組合運算的，下面我們來看幾下例子： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1、先來看看0x01 &nbsp; (新建塊)和0X04 &nbsp;(設定校驗和) 的組合 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 我的版本是11gr2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; select * from v$version; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> BANNER </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> -------------------------------------------------------------------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 由於11gr2在建立表的時侯有個延遲段引數的控制，預設不分配EXTNETS空間 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; show show parameter deferred_segment_creation </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> showmode OFF </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> NAME &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TYPE &nbsp; &nbsp; &nbsp; &nbsp;VALUE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------------ ----------- ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> deferred_segment_creation &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;boolean &nbsp; &nbsp; TRUE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 那麼我在建表的同時要立馬分配EXTENTS,好我馬上建個表，操作如下： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; create table t20(id int ,name varchar2(10)) SEGMENT CREATION IMMEDIATE; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Table created. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 查分配的區號，檔案號，塊號 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; select extent_id,file_id,block_id from dba_extents where segment_name='T20'; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> EXTENT_ID &nbsp; &nbsp;FILE_ID &nbsp; BLOCK_ID </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------- ---------- ---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp;152 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 對3號檔案的152號塊做DUMP,做dump時最好新打會一個會話，避免產生不必要的日誌，操作如下 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@ocm ~]$ sqlplus / as sysdba </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL*Plus: Release 11.2.0.1.0 Production on Mon Mar 18 07:40:55 2013 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Copyright (c) 1982, 2009, Oracle. &nbsp;All rights reserved. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Connected to: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> With the Partitioning, OLAP, Data Mining and Real Application Testing options </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; alter system dump datafile 3 block 152; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 好，現在馬上到找到跟蹤日誌 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; show parameter dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> NAME &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TYPE &nbsp; &nbsp; &nbsp; &nbsp;VALUE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------------ ----------- ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> background_core_dump &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;partial </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> background_dump_dest &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;/u01/app/oracle/diag/rdbms/ocm </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/ocm/trace </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> core_dump_dest &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;/u01/app/oracle/diag/rdbms/ocm </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/ocm/cdump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> max_dump_file_size &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;unlimited </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> shadow_core_dump &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;partial </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> user_dump_dest &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; string &nbsp; &nbsp; &nbsp;/u01/app/oracle/diag/rdbms/ocm </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/ocm/trace </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@ocm trace]$ cd /u01/app/oracle/diag/rdbms/ocm/ocm/trace </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@ocm trace]$ ls -lFtr </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> [oracle@ocm trace]$ more ocm_ora_12910.trc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 貼出資料塊頭的資訊： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> scn: 0x0000.00000000 seq: 0x01 flg: 0x05 tail: 0x00000001 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frmt: 0x02 chkval: 0xa798 type: 0x00=unknown </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 從上面看出flg是flg: 0x05，就是0x01 +0x04的組合, </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01說明這是一個新建的塊，因為我的表的是剛剛建立的，沒有向塊中插入資料。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x04說明有設定校驗，chkval: 0xa798這個就是校驗和，這個與引數db_block_checksum有關 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; show parameter db_block_checksum </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> NAME &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; TYPE &nbsp; &nbsp; &nbsp; &nbsp;VALUE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------------ ----------- ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> db_block_checksum &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;string &nbsp; &nbsp; &nbsp;TYPICAL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 預設設定了db_block_checksum，就會啟動校驗和檢查資料塊的一致性。另外資料塊尾部的4個位元組也是配合資料塊頭來驗證資料塊的一致性。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 如果一個塊頭被標識成軟損壞，那麼塊頭的序列號為0xff,標誌為0x00 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2、再來看0x2 &nbsp; (資料塊延遲清洗推進scn和seq) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 對於延遲塊清洗推進要細說有點複雜，到時候對這一塊開個專題，這裡我就簡單介紹一下。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 在11g版本中，對資料DML操作，Oracle都是採取快速提交，在事務槽中可以觀察到,OK,我先來做個測試來驗證一下： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 先插入一條數，然後提交，再dump，操作如下： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; insert into t1 values(2,'BBBBB'); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row created. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Commit complete. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; alter system flush buffer_cache; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; gyj@OCM&gt; select id,name,dbms_rowid.rowid_relative_fno(rowid),dbms_rowid.rowid_block_number(rowid) from t1 where id=2; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; ID NAME &nbsp; &nbsp; &nbsp; DBMS_ROWID.ROWID_RELATIVE_FNO(ROWID) DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---- ---------- ------------------------------------ ------------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;2 BBBBB &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;132 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; alter system dump datafile 3 block 132; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> dump 的內容如下：注意看下面的紅色字型部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料塊頭 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> buffer tsn: 7 rdba: 0x00c00084 (3/132) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> scn: 0x0000.004bb8d3 seq: 0x02 flg: 0x06 tail:0xb8d30602 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frmt: 0x02 chkval: 0x6a0c type:0x06=trans data </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 事務ITL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Object id on Block? Y </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12723 csc: 0x00.4bb8d1 &nbsp;itc: 2 flg: E &nbsp;typ: 1 - DATA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;brn: 0 &nbsp;bdba:0xc00080 ver: 0x01 opc: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;inc: 0 exflg: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Uba &nbsp; &nbsp; &nbsp; &nbsp;Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; &nbsp;Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp; 0x0008.016.00001131 0x018019a3.0160.16 &nbsp;--U- &nbsp; &nbsp;1 &nbsp;fsc 0x0000.004bb8d3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp; 0x0003.013.0000107a 0x018017c7.0128.23 &nbsp;C--- &nbsp; &nbsp;0 &nbsp;scn 0x0000.004bb60d </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> bdba: 0x00c00084 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> data_block_dump,data header at0x827664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> =============== </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tsiz: 0x1f98 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> hsiz: 0x18 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> pbl: 0x00827664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;76543210 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x18 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f5d </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f5d </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp;nrow=3 offs=0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; offs=0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x14:pri[1] &nbsp; &nbsp; offs=0x1f81 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x16:pri[2] &nbsp; &nbsp; offs=0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> block_row_dump: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x0 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;41 41 41 41 41 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 1, @0x1f81 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 11 fb: --H-FL-- lb: 0x0 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 4] &nbsp;67 79 6a 31 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 2, @0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x1 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 03 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;42 42 42 42 42 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> end_of_block_dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 從上面的事務ITL上看到0x01 0x0008.016.00001131 0x018019a3.0160.16 --U- 1 fsc 0x0000.004bb8d3，這裡提交標記是U,表示快示提交，它對應的就是我們的剛剛插入的那行記錄。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 即 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; insert into t1 values(2,'BBBBB'); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row created. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 實際上很容易看出，從上面的資料看出 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 2, @0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x1 cc: 2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;---lb: 0x1 對應的就是事務槽的1號槽。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col 0: [ 2] c1 03 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col 1: [ 5] 42 42 42 42 42 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;----16進位制42就是B </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 那麼什麼時候會把提交標記U變成C呢，當我再修改另一行記錄時，Oracle向 0x02 0x0003.013.0000107a 0x018017c7.0128.23 C--- 0 scn 0x0000.004bb60d &nbsp;2號事務槽插入事務，2號事槽的提交標記又變成快速提交，同時oracle會把原來1號事務槽的提交標記由U（快速提交）變成C（正常提交），並且同時還清除鎖標記Lck ＝0 &nbsp;and lb: 0x00,最後就是我們要說的資料塊延遲清洗推進 ，即在csc: 0x00.4bb8d1 改修最後的SCN,實際上csc 是本塊的最小的commit SCN. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 那下面我按上面所說再來做個操作，即插入一下資料，提交，dump，再觀察 塊頭的 flg,事務槽,資料,及 csc。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; update t1 set name='CCCCC' where id=1; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2 rows updated. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Commit complete. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; alter system flush buffer_cache; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; alter system dump datafile 3 block 132; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> dump 的內容如下：注意看下面的紅色字型部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料塊頭 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> buffer tsn: 7 rdba: 0x00c00084 (3/132) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> scn: 0x0000.004bbba3 seq: 0x03 flg: 0x06 tail:0xbba30603 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frmt: 0x02 chkval: 0x3d04 type:0x06=trans data </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 事務ITL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Block header dump: &nbsp;0x00c00084 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Object id on Block? Y </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12723 &nbsp;csc:0x00.4bb8d1 &nbsp;itc: 2 &nbsp;flg: E &nbsp;typ: 1 - DATA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;brn: 0 &nbsp;bdba:0xc00080 ver: 0x01 opc: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;inc: 0 exflg: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Uba &nbsp; &nbsp; &nbsp; &nbsp;Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; &nbsp;Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp; 0x0008.016.00001131 0x018019a3.0160.16 &nbsp;--U- &nbsp; &nbsp;1 &nbsp;fsc 0x0000.004bb8d3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp; 0x0004.003.00000c54 0x01801a36.00d1.03 &nbsp;--U- &nbsp; &nbsp;2 &nbsp;fsc 0x0000.004bbba3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> bdba: 0x00c00084 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> data_block_dump,data header at0xc03664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> =============== </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tsiz: 0x1f98 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> hsiz: 0x18 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> pbl: 0x00c03664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;76543210 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x18 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f69 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f5c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f5c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp;nrow=3 offs=0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; offs=0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x14:pri[1] &nbsp; &nbsp; offs=0x1f69 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x16:pri[2] &nbsp; &nbsp; offs=0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> block_row_dump: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x2 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;43 43 43 43 43 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 1, @0x1f69 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x2 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;43 43 43 43 43 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 2, @0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x1 &nbsp;cc:2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 03 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;42 42 42 42 42 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> end_of_block_dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> dump出來發現不是我上面所說的，呵呵。。。，現在兩個事務槽的提交標記都是U，U就是代表快速提交，即不清楚行鎖。看下面兩個dump的csc: 0x00.4bb8d1 即資料塊延遲 清洗 沒有推進，不要急，我們再做一個操作，再操作一下事務，這次肯定會清楚行鎖 ，並且csc: 0x00.4bb8d1 即 資料塊延遲 &nbsp;清洗 肯定會推進。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; insert into t1 values(3,'DDDDDD') ; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row created. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Commit complete. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; alter system flush buffer_cache; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; alter system dump datafile 3 block 132; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> dump 的內容如下：注意看下面的紅色字型部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料塊頭 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> buffer tsn: 7 rdba: 0x00c00084 (3/132) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> scn: 0x0000.004bbd8b seq: 0x01 flg: 0x06 tail: 0xbd8b0601 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frmt: 0x02 chkval: 0xc1f4 type: 0x06=trans data </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 事務ITL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Object id on Block? Y </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12723 &nbsp;csc: 0x00.4bbd8a &nbsp;itc: 2 &nbsp;flg:E &nbsp;typ: 1 - DATA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;brn: 0 &nbsp;bdba: 0xc00080 ver: 0x01 opc: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;inc: 0 &nbsp;exflg: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Uba &nbsp; &nbsp; &nbsp; &nbsp;Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp;0x0002.014.0000105d &nbsp;0x01801aa2.0130.17 &nbsp;--U- &nbsp; 1 &nbsp;fsc 0x0000.004bbd8b </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp;0x0004.003.00000c54 &nbsp;0x01801a36.00d1.03 &nbsp;C--- &nbsp; 0 &nbsp;scn 0x0000.004bbba3 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料部分 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> bdba: 0x00c00084 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> data_block_dump,data header at 0xd85664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> =============== </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tsiz: 0x1f98 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> hsiz: 0x1a </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> pbl: 0x00d85664 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;76543210 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=4 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x1a </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f5c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f4d </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f4d </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp;nrow=4 &nbsp;offs=0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; offs=0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x14:pri[1] &nbsp; &nbsp; offs=0x1f69 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x16:pri[2] &nbsp; &nbsp; offs=0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x18:pri[3] &nbsp; &nbsp; offs=0x1f5c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> block_row_dump: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f8c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x0 &nbsp;cc: 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;43 43 43 43 43 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 1, @0x1f69 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x0 &nbsp;cc: 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 02 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;43 43 43 43 43 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 2, @0x1f75 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 12 fb: --H-FL-- lb: 0x0 &nbsp;cc: 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 03 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 5] &nbsp;42 42 42 42 42 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 3, @0x1f5c </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 13 fb: --H-FL-- lb: 0x1 &nbsp;cc: 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c1 04 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;1: [ 6] &nbsp;44 44 44 44 44 44 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> end_of_block_dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flg: 0x06 ＝0x02+0x04 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 果然是這樣，當事務槽上的提交標誌都是快速提交（U），那再有事務進來，Oracle先找個ITL SLOT插入事務，順便把其它ITL slot上的快速提交U 變成正常提交C，並且清除行鎖，最最最得要我想說的就是 csc: 0x00.4bbd8a 資料塊延遲 清洗真的推進了(原來是csc: 0x00.4bb8d1)。。。 一定記住 csc: 0x00.4bbd8a 是資料本塊中最小的COMMIT SCN，實際上它表示上次事務槽上沒清除的鎖現在清除一下，然後就做了一個延遲 清洗推進 . </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp;好，即然說到這裡，我再對資料塊中非常重要的一塊再單獨拿出來講講：就是ITL（事務槽），事務在資料庫中非常重要，如果要細講事務，那東西很多。這裡我先來簡單講講事務。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; 那什麼是事務？事務的定義是一個獨立的邏輯工作單元：它由特定的一系列必須作為一個整體一起成功或失敗的SQL語句組成。事務可以由多個資料操作語言(data manipulation language,DML)語句組成，但只能含有一個資料定義語言(data definition language,DDL)語句。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; 事務的ACID特徵 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 　 &nbsp; &nbsp;A)、原子性(Atomicity) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; 　　事務中的所有動作要麼都發生，要麼都不發生 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 　 &nbsp; &nbsp;B)、一致性(Consistency) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; 事務將資料庫從一種狀態轉變為下一種一致狀態 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; C)、隔離性(Isolation) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;一個事務的影響在該事務提交前對其他事務都不可見 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 　 &nbsp; &nbsp;D)、永續性(Durability) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;事務一旦提交，其結果就是永久性的 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;事務的定義和特性就說到這裡，我繼續dump，分本一下資料塊中的ITL槽，OK，我現在馬上開始一個事務： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;我現在把T1表中的id=3的這行的name=DDDDDD 改成EEEEEE，做UPDATE操作，不提交，讓事務一直活動著。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; select id,name,dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) block# </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> from t1 where id=3; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; ID NAME &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;FILE# &nbsp; &nbsp; BLOCK# </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------- ---------- ---------- ---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 DDDDDD &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp;132 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; update t1 set name ='EEEEEE' where id=3; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row updated. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 這時先不要提交，讓事務活動著，一會去觀察塊中的ITL槽，為了能讓上面修改的資料馬上寫到資料檔案，執行快取重新整理操作， </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 如下： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> gyj@OCM&gt; alter system flush buffer_cache; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 好，這時，我馬上開一個新視窗做dump操作： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; sys@OCM&gt; alter system dump datafile 3 block 132; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;貼出DUMP的主要內容ITL部分： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Object id on Block? Y </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> seg/obj: 0x12723 &nbsp;csc: 0x00.4c5fd3 &nbsp;itc: 2 &nbsp;flg: E &nbsp;typ: 1 - DATA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;brn: 0 &nbsp;bdba: 0xc00080 ver: 0x01 opc: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;inc: 0 &nbsp;exflg: 0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Uba &nbsp; &nbsp; &nbsp; &nbsp; Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; &nbsp;Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01 &nbsp; 0x0002.014.0000105d &nbsp;0x01801aa2.0130.17 &nbsp;C--- &nbsp; &nbsp;0 &nbsp;scn 0x0000.004bbd8b </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp; 0x0008.00b.00001144 &nbsp;0x01801e95.0161.1b &nbsp;---- &nbsp; &nbsp;1 &nbsp;fsc 0x0000.00000000 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這裡 seg/obj: 0x12723就是物件號，我們用計算器把0x12723(16進位制轉化成10進位制)得到75555，就是說對角號是75555. </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; select OBJECT_ID,DATA_OBJECT_ID from dba_objects where object_NAME='T1' and owner='GYJ'; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> OBJECT_ID DATA_OBJECT_ID </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------- -------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp;75350 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;75555 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 各位兄弟注意了，這裡的物件號是指段的號即DATA_OBJECT_ID（ OBJECT_ID與DATA_OBJECT_ID，什麼時候不一樣呢，一般做truncate操作，DATA_OBJECT_ID就會發生變化，這裡就不細說了） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 好，我們的重點就是看ITL槽，從上面的ITL看出，我們剛剛操作的update正在活動的事務就是在第二個事務槽上即： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Itl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Xid &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Uba &nbsp; &nbsp; &nbsp; &nbsp; Flag &nbsp;Lck &nbsp; &nbsp; &nbsp; &nbsp;Scn/Fsc </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x02 &nbsp; 0x0008.00b.00001144 &nbsp;0x01801e95.0161.1b &nbsp;---- &nbsp; &nbsp;1 &nbsp;fsc 0x0000.00000000 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 我主要來分析一下Xid和Uba </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 首先Xid是由XIDUSN（Undo segment number）、XIDSLOT（Slot number）+XIDSQN（Sequence number）三部分組成的。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; OK，即然說到事務，我們不得不看檢視:v$transaction: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; select xid,xidusn,xidslot,xidsqn,ubafil,ubablk,ubasqn,ubarec,status from v$transaction; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> XID &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;XIDUSN &nbsp; &nbsp;XIDSLOT &nbsp; &nbsp; XIDSQN &nbsp; &nbsp; UBAFIL &nbsp; &nbsp; UBABLK &nbsp; &nbsp; UBASQN &nbsp; &nbsp; UBAREC STATUS </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 08000B0044110000 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;8 &nbsp; &nbsp; &nbsp; &nbsp; 11 &nbsp; &nbsp; &nbsp; 4420 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6 &nbsp; &nbsp; &nbsp; 7829 &nbsp; &nbsp; &nbsp; &nbsp;353 &nbsp; &nbsp; &nbsp; &nbsp; 27 ACTIVE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 從上面的檢視v$transaction得到： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;XIDUSN＝8 &nbsp; &nbsp;(8號回滾段) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;XIDSLOT＝11 &nbsp;(在8號回滾段的事務表的第11行)，哥哥這裡不要暈哦，這裡的事務表是指8號回滾段的段頭塊。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp;XIDSQN＝4420 (事務表第11行被覆蓋了4420次) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 把上面資料塊中ITL事務槽中的Xid＝0x0008.00b.00001144進行分解，你們看： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 0x0008 （16進位制）－－&gt; （10進位制）8 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 00b &nbsp;（16進位制）－－&gt;（10進位制） 11 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 00001144（16進位制）－－&gt;（10進位制）4420 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 分解出來完本與我們在transaction中看到的 XIDUSN &nbsp; &nbsp;XIDSLOT &nbsp; &nbsp; XIDSQN完成一樣！ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 好，我們再來看ILT中的Uba＝0x01801e95.0161.1b進行分析： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Uba由檔案號、塊號、序列號及記錄號四部分組成的： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x01801e95（16進位制）－－&gt; （10進位制）由四個位元組組成把它轉成32位的二進位制，取前面10位二進位制得到0000000110＝6，剩下的 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 22位＝7829（其實就是0x1e95用計算器轉得到7829） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0161 （16進位制）－－&gt; （10進位制） 353 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1b &nbsp; &nbsp;（16進位制）－－&gt; （10進位制） 27 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 我靠，分解出來與我們在transaction中看到的UBAFIL &nbsp; &nbsp; UBABLK &nbsp; &nbsp; UBASQN &nbsp; &nbsp; UBAREC完成一致！ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 兄弟們，你們覺得知道這些有什麼用嗎，其實很有用啊，這些就是UNDO啊，呵呵Oracle之前就靠UNDO打下半壁江山，對於UNDO，我 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 會在下後面的帖中做詳細介紹讓徹底解讀UNDO讓一致性讀不再是秘密！（這裡留個位置放undo的超連結） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 講到這裡，其實還有個跟事務分不開的東東，那就是鎖，一個很重要的檢視：v$lock; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> sys@OCM&gt; select * from v$lock where sid=183; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ADDR &nbsp; &nbsp; KADDR &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SID TY &nbsp; &nbsp; &nbsp; &nbsp;ID1 &nbsp; &nbsp; &nbsp; &nbsp;ID2 &nbsp; &nbsp; &nbsp;LMODE &nbsp; &nbsp;REQUEST &nbsp; &nbsp; &nbsp;CTIME &nbsp; &nbsp; &nbsp;BLOCK </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> -------- -------- ---------- -- ---------- ---------- ---------- ---------- ---------- ---------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 50C84DA4 50C84DD0 &nbsp; &nbsp; &nbsp; &nbsp;183 AE &nbsp; &nbsp; &nbsp; &nbsp;100 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp;22492 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 02066600 02066630 &nbsp; &nbsp; &nbsp; &nbsp;183 TM &nbsp; &nbsp; &nbsp;75350 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; 2893 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 4FA268F4 4FA26934 &nbsp; &nbsp; &nbsp; &nbsp;183 TX &nbsp; &nbsp; 524299 &nbsp; &nbsp; &nbsp; 4420 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 &nbsp; &nbsp; &nbsp; 2893 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這資訊很有用： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> TM鎖：TM-75350-0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> TX鎖：TX-524299-4420 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 對於鎖制機會在後面的帖中分享一下移動級的：鎖等待分析處理、DX鎖等待處理（這裡留個位置放超連結） </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 最後總結：資料塊的組成部分，包括以下四部分： </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1、資料塊頭 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 2、事務槽ITL </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 3、資料 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 4、資料塊尾 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 資料塊格式就先說到這裡了，有問題的兄弟可以一起討論學習！不斷更新中。。。 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ****************************************************************************************************** </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 補充：NUMBER型別的轉儲 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c2 02 數字100轉存後是這樣 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select (to_number('2','xxxx')-1)*power(100,to_number('c2','xxxx')-193) from dual; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> (TO_NUMBER('2','XXXX')-1)*POWE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;100 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這樣就算回去了 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 數字-123.333 轉存後是 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 6] &nbsp;3d 64 59 59 47 66 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> select -((101 - to_number('64', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx')) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('59', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 1) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('59', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 2) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('47', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 3) ) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這樣就算回去了 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 轉存後是16進位制的 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 要 改回10進位制 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 建立一個表 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; create table t１ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 2 &nbsp;(it number); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Table created </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; insert into t１ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 2 &nbsp;values(100); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row inserted </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 計算器塊 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select rowid from t１; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ROWID </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> AAAXKYAABAAAU4aAAA </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select dbms_rowid.rowid_relative_fno('AAAXKYAABAAAU4aAAA'),dbms_rowid.rowid_block_number('AAAXKYAABAAAU4aAAA') from t１; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> DBMS_ROWID.ROWID_RELATIVE_FNO( DBMS_ROWID.ROWID_BLOCK_NUMBER( </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------ ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;85530 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 進行DUMP </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; alter system dump datafile 1 block 85530; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> System altered </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 檢視其數字的dump格式 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> flag=-------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ntab=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> nrow=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> frre=-1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fsbo=0x14 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> fseo=0x1f9a </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> avsp=0x1f83 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tosp=0x1f83 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0xe:pti[0] &nbsp; &nbsp; &nbsp; &nbsp;nrow=1 &nbsp; &nbsp; &nbsp; &nbsp;offs=0 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 0x12:pri[0] &nbsp; &nbsp; &nbsp; &nbsp;offs=0x1f9a </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> block_row_dump: </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 0, @0x1f9a </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 6 fb: --H-FL-- lb: 0x1 &nbsp;cc: 1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 2] &nbsp;c2 02 &nbsp;----這裡就是DUMP出來的，長度是2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> end_of_block_dump </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> End dump data blocks tsn: 0 file#: 1 minblk 85530 maxblk 85530 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 其實這裡的C2 02就是其具體的數字。使用DUMP函式也能得出 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select dump(it,16) from t１; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> DUMP(IT,16) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> -------------------------------------------------------------------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Typ=2 Len=2: c2,2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 然後透過ORACLE的演算法計算回去 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select to_number('c2','xxxx') from dual; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> TO_NUMBER('C2','XXXX') </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ---------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;194 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select to_number('2','xxxx') from dual; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> TO_NUMBER('2','XXXX') </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> --------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 其實這裡的如果換算為10進位制是 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 194,2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 如果大於128 就是正數，小於128就是負數 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 指數是194-193=1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 數字位1 是2-1=1*100^(1-0)=100 -1是因為正數+1儲存 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 所以數字也就還原為100 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select (to_number('2','xxxx')-1)*power(100,to_number('c2','xxxx')-193) from dual; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> (TO_NUMBER('2','XXXX')-1)*POWE </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> ------------------------------ </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;100 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 用SQL就是這樣，這是第一位 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 在加入一個負數 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; insert into test </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; 2 &nbsp;values(-123.333); </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 1 row inserted </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; commit; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Commit complete </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 進行DUMP如上 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tab 0, row 1, @0x1f90 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> tl: 10 fb: --H-FL-- lb: 0x2 &nbsp;cc: 1 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> col &nbsp;0: [ 6] &nbsp;3d 64 59 59 47 66 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 進行計算 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Typ=2 Len=6: 3d,64,59,59,47,66 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> SQL&gt; select dump(it,16) from testpp; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> DUMP(IT,16) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> -------------------------------------------------------------------------------- </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Typ=2 Len=2: c2,2 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> Typ=2 Len=6: 3d,64,59,59,47,66 &nbsp;--66 及10進位制的102是一個排序位不用理會，用在負數的時候 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 內部儲存長度6 指數3d 後面數數字位 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 換算為10進位制就是 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 61，100，89，89，71，102 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 61是指數未 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 102 是排序位 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 中間的數字位 </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> select -((101 - to_number('64', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx')) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('59', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 1) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('59', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 2) + </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;(101 - to_number('47', 'xxxx')) * </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; &nbsp; &nbsp; &nbsp;power(100, 62 - to_number('3d', 'xxxx') - 3) ) </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> &nbsp; from dual; </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> <br style="background-color:inherit;" /> </div> <div style="font-family:微軟雅黑;font-size:14px;line-height:21px;white-space:normal;widows:auto;background-color:#FFFFFF;"> 這樣數字就完成了轉換。 </div>

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