oracle實驗記錄 (oracle 詳細分析redo(4))
關於redo 結構:
SQL> conn xh/a831115;
已連線。
SQL> select * from test;
A
----------
a
SQL> select group#,status from v$log;
GROUP# STATUS
---------- ----------------
1 INACTIVE
2 INACTIVE
3 CURRENT
SQL> col member format a40
SQL> select group#,member from v$logfile;
GROUP# MEMBER
---------- ----------------------------------------
3 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO03.LOG
2 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO02.LOG
1 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO01.LOG
SQL> update test set a='b';
已更新 1 行。~~~~~~~~~~~~~~~~~~~~~~~~~~~~未commit
SQL>
SQL> select xidusn ,ubafil,UBABLK from v$transaction;
XIDUSN UBAFIL UBABLK
---------- ---------- ----------
3 2 2194
可以看到這個事務使用的 undo block 是 file 2,block 2194
SQL> select * from v$rollname where usn=3;
USN NAME
---------- ------------------------------
3 _SYSSMU3$
SQL> select header_block,header_file from dba_segments where segment_name='_SYSS
MU3$';
HEADER_BLOCK HEADER_FILE
------------ -----------
41 2
SQL> select object_id from user_objects where object_name='TEST';
OBJECT_ID
----------
54147
SQL> alter system dump logfile 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\REDO03.L
og';
系統已更改。
根據 object_id找到 相關資訊
可以看到這個redo record中 有 3個 change vector(比如CHANGE #1)
REDO RECORD - Thread:1 RBA: 0x000003.00000beb.0010 LEN: 0x01c0 VLD: 0x0d
SCN: 0x0000.0045246b SUBSCN: 1 10/21/2009 09:23:22
CHANGE #1 TYP:0 CLS: 1 AFN:4 DBA:0x010001c4 OBJ:54147 SCN:0x0000.00445bbf SEQ: 1 OP:11.19
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0003.021.00000542 uba: 0x00800892.0281.18
Array Update of 1 rows:
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 2 ckix: 7
ncol: 1 nnew: 1 size: 0
KDO Op code: 21 row dependencies Disabled
xtype: XAxtype KDO_KDOM2 flags: 0x00000080 bdba: 0x010001c4 hdba: 0x010001c3
itli: 2 ispac: 0 maxfr: 4858
vect = 0
col 0: [ 1] 62
CHANGE #2 TYP:0 CLS:21 AFN:2 DBA:0x00800029 OBJ:4294967295 SCN:0x0000.00452413 SEQ: 1 OP:5.2
ktudh redo: slt: 0x0021 sqn: 0x00000542 flg: 0x0012 siz: 152 fbi: 0
uba: 0x00800892.0281.18 pxid: 0x0000.000.00000000
CHANGE #3 TYP:0 CLS:22 AFN:2 DBA:0x00800892 OBJ:4294967295 SCN:0x0000.00452412 SEQ: 2 OP:5.1
ktudb redo: siz: 152 spc: 4888 flg: 0x0012 seq: 0x0281 rec: 0x18
xid: 0x0003.021.00000542
ktubl redo: slt: 33 rci: 0 opc: 11.1 objn: 54147 objd: 54147 tsn: 4
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x00800892.0281.16
prev ctl max cmt scn: 0x0000.00451e95 prev tx cmt scn: 0x0000.00451e9b
txn start scn: 0x0000.004523eb logon user: 61 prev brb: 0 prev bcl: 0 KDO undo record:
KTB Redo
op: 0x03 ver: 0x01
op: Z
Array Update of 1 rows:
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 7
ncol: 1 nnew: 1 size: 0
KDO Op code: 21 row dependencies Disabled
xtype: XAxtype KDO_KDOM2 flags: 0x00000080 bdba: 0x010001c4 hdba: 0x010001c3
itli: 2 ispac: 0 maxfr: 4858
vect = 0
col 0: [ 1] 61
分析 可以 從 AFN:看出是 對 那個檔案的修改,AFN 絕對檔案號
所以change#1 記錄對datafile 4的 修改,dba是 對應的 塊
DBA:0x010001c4
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('0001c4','xx
xxxxx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('0001c4','xx
xxxx'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
4
SQL> print blk#
BLK#
----------
452
SQL> select file#,block# from (select dbms_rowid.rowid_relative_fno(rowid) file#
,dbms_rowid.rowid_block_number(rowid) block# from xh.test);
FILE# BLOCK#
---------- ----------
4 452
可以看出 這個 change vector記錄的是 修改datafile 4,block 452的 記錄 正是,修改test 表的記錄
uba: 0x00800892.0281.18
0281是序號,18是條目號
uba 是 記錄了 這個塊修改後的 undo記錄 放在undo 那個塊中
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('00892','xxx
xxxx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('00892','xxx
xxx'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
2
SQL> print blk#
BLK#
----------
2194
可以看到 修改test後 的舊值(a) 放在undo file 2 ,block 2194中
col 0: [ 1] 62 就是 undo記錄中 ,記錄 修改後的 值(upate test set a='b')
SQL> select chr(to_number(62,'xx')) from dual;
CH
--
b
KDO Op code: 21 d代表 事務進行操作的型別程式碼 21 代表 update
xid: 0x0003.021.00000542 對應著
SQL> select to_number('21','xxxxxx') from dual;
TO_NUMBER('21','XXXXXX')
------------------------
33
SQL> select to_number('542','xxxxxx') from dual;
TO_NUMBER('542','XXXXXX')
-------------------------
1346
SQL>
SQL> select XIDUSN,XIDSLOT,XIDSQN from v$transaction;(user xh session執行)
XIDUSN XIDSLOT XIDSQN
---------- ---------- ----------
3 33 1346
XIDUSN NUMBER Undo segment number
XIDSLOT NUMBER Slot number
XIDSQN NUMBER Sequence number
Array Update of 1 rows: 也顯示了 update 1 rows
bdba: 0x010001c4 :也表示修改的 test的資料塊 與dba一樣(data block address)
是 file 4,block 452
hdba: 0x010001c3:表示的是test表的 segment header block
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('1c3','xxxxx
xx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('1c3','xxxxx
x'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
4
SQL> print blk#
BLK#
----------
451
SQL> select header_file,header_block from dba_segments where segment_name='TEST'
;
HEADER_FILE HEADER_BLOCK
----------- ------------
4 451
基本change #1的 重要資訊 瞭解完了,可以清楚的看到redo中都記錄了些什麼
CHANGE #2 AFN:2可以看到是對 undo 的 修改的記錄
DBA:0x00800029 OBJ:4294967295
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('800029','xx
xxxxx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('800029','xx
xxxx'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
2
SQL> print blk#
BLK#
----------
41
這正是對undo segment header的修改,要修改事務表(存undo segment header)
uba: 0x00800892.0281.18 :記錄了放 test舊值的undo block 所在地址,與change#1中的一樣
change#3:
CHANGE #3 TYP:0 CLS:22 AFN:2 DBA:0x00800892
anf 表示這個還是記錄的undo file的資訊 ,DBA表示的 是哪個undo 塊
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('800892','xx
xxxxx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('800892','xx
xxxx'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
2
SQL> print blk#
BLK#
----------
2194
可以看到這個塊 就是記錄test 舊值得塊,chang#3 記錄了對這個undo 塊的 修改,所以redo是保護undo的
ktubl redo: slt: 33 rci: 0 opc: 11.1 objn: 54147 objd: 54147 tsn: 4
OBJD可以看到是記錄的物件是xh.test
slt: 33=XIDSLOT NUMBER Slot number
logon user: 61 登陸操作的user id
SQL> select username from dba_users where user_id=61;
USERNAME
------------------------------
XH
KDO Op code: 21:表示還是一個update操作
bdba: 0x010001c4 hdba: 0x010001c3
BDBA:記錄的是fil 4 block 452 表示是test表的資料塊地址,hdba 是file 4,block 451 表示是test segment header block
col 0: [ 1] 61:表示修改前的值
SQL> select chr(to_number(61,'xx')) from dual;
CH
--
a
SQL> alter system dump datafile 2 block 2194;
系統已更改。
根據object_id找
dump log file中 change#1中uba: 0x00800892.0281.18,change#3中dba 可以現在dump datablock trace中 rec 0x18 為uba中18 表示slot號
* Rec #0x18 slt: 0x21 objn: 54147(0x0000d383) objd: 54147 tblspc: 4(0x00000004)
* Layer: 11 (Row) opc: 1 rci 0x00
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
rdba: 0x00000000
*-----------------------------
uba: 0x00800892.0281.16 ctl max scn: 0x0000.00451e95 prv tx scn: 0x0000.00451e9b
txn start scn: scn: 0x0000.004523eb logon user: 61
prev brb: 0 prev bcl: 0
KDO undo record:
KTB Redo
op: 0x03 ver: 0x01
op: Z
Array Update of 1 rows:
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 7
ncol: 1 nnew: 1 size: 0
KDO Op code: 21 row dependencies Disabled
xtype: XAxtype KDO_KDOM2 flags: 0x00000080 bdba: 0x010001c4 hdba: 0x010001c3
itli: 2 ispac: 0 maxfr: 4858
vect = 0
col 0: [ 1] 61~~~~~~~~~~~~~~~~~~~~~~~記錄舊得值 a
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
關於redo 結構補充 (使用者commit 時間)
1.update 後 馬上commit
SQL> conn xh/a831115;
已連線。
SQL> select * from test;
A
----------
b
SQL> select group#,status from v$log;
GROUP# STATUS
---------- ----------------
1 INACTIVE
2 CURRENT
3 INACTIVE
SQL> col member format a40
SQL> select group#,member from v$logfile;
GROUP# MEMBER
---------- ----------------------------------------
3 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO03.LOG
2 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO02.LOG
1 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO01.LOG
SQL> update test set a='e';
已更新 1 行。
SQL> commit;~~~~~~~~~~~~如果update 後 ,緊接著 commit
SQL> alter system dump logfile 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\REDO01.L
og';
系統已更改。
SQL> select object_id from user_objects where object_name='TEST';
OBJECT_ID
----------
54147
SCN: 0x0000.0047ea28 SUBSCN: 8 10/22/2009 13:24:26
CHANGE #1 TYP:2 CLS: 1 AFN:4 DBA:0x010001c4 OBJ:54147 SCN:0x0000.0047e97c SEQ: 2 OP:11.19
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0002.010.00000572 uba: 0x008006cc.04e3.1a
Block cleanout record, scn: 0x0000.0047ea22 ver: 0x01 opt: 0x02, entries follow...
itli: 2 flg: 2 scn: 0x0000.0047e97c
Array Update of 1 rows:
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 1 ckix: 8
ncol: 1 nnew: 1 size: 0
KDO Op code: 21 row dependencies Disabled
xtype: XAxtype KDO_KDOM2 flags: 0x00000080 bdba: 0x010001c4 hdba: 0x010001c3
itli: 1 ispac: 0 maxfr: 4858
vect = 0
col 0: [ 1] 65~~~~~新值
CHANGE #2 TYP:0 CLS:19 AFN:2 DBA:0x00800019 OBJ:4294967295 SCN:0x0000.0047e9e1 SEQ: 2 OP:5.2
ktudh redo: slt: 0x0010 sqn: 0x00000572 flg: 0x0012 siz: 176 fbi: 0
uba: 0x008006cc.04e3.1a pxid: 0x0000.000.00000000
CHANGE #3 TYP:0 CLS:19 AFN:2 DBA:0x00800019 OBJ:4294967295 SCN:0x0000.0047ea28 SEQ: 1 OP:5.4
ktucm redo: slt: 0x0010 sqn: 0x00000572 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x008006cc.04e3.1a ext: 2 spc: 4558 fbi: 0
CHANGE #4 TYP:0 CLS:20 AFN:2 DBA:0x008006cc OBJ:4294967295 SCN:0x0000.0047e9e1 SEQ: 3 OP:5.1
ktudb redo: siz: 176 spc: 4736 flg: 0x0012 seq: 0x04e3 rec: 0x1a
xid: 0x0002.010.00000572
ktubl redo: slt: 16 rci: 0 opc: 11.1 objn: 54147 objd: 54147 tsn: 4
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x008006cc.04e3.17
prev ctl max cmt scn: 0x0000.0047e4f2 prev tx cmt scn: 0x0000.0047e52f
txn start scn: 0x0000.00000000 logon user: 61 prev brb: 8390340 prev bcl: 0 KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x000a.014.00000453 uba: 0x00800bc0.037a.2a
flg: C--- lkc: 0 scn: 0x0000.0047e8e8
Array Update of 1 rows:
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 8
ncol: 1 nnew: 1 size: 0
KDO Op code: 21 row dependencies Disabled
xtype: XAxtype KDO_KDOM2 flags: 0x00000080 bdba: 0x010001c4 hdba: 0x010001c3
itli: 1 ispac: 0 maxfr: 4858
vect = 0
col 0: [ 1] 64~~~~~~~~~=舊值
具體內容就不 解釋了,可以看到 這個redo record 產生了 4個 change vector,其中 change#2 ,chang#3都是修改 undo segment header 產生的 change vector
可以清楚的看到change#3是commit後的記錄( sta: 9 提交標記 為9 代表已經提交)
2.實驗 update後 過一會commit
SQL> select group#,status from v$log;
GROUP# STATUS
---------- ----------------
1 UNUSED~~~~~~~~~~~~~~做了clear
2 CURRENT
3 UNUSED~~~~~~~~~~~~~~做了clear
SQL> alter system switch logfile;
系統已更改。
SQL> alter system checkpoint;
系統已更改。
SQL> select group#,status from v$log;
GROUP# STATUS
---------- ----------------
1 CURRENT
2 INACTIVE
3 UNUSED
SQL> col member format a40
SQL> select group#,member from v$logfile;
GROUP# MEMBER
---------- ----------------------------------------
3 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO03.LOG
2 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO02.LOG
1 F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\
REDO01.LOG
SQL> update test set a='bbb';
已更新 1 行。
SQL> select object_id from user_objects where object_name='TEST';
OBJECT_ID
----------
54147
SQL> select xidusn ,ubafil,UBABLK from v$transaction;
XIDUSN UBAFIL UBABLK
---------- ---------- ----------
9 2 523
SQL> select * from v$rollname where usn=9;
USN NAME
---------- ------------------------------
9 _SYSSMU9$
SQL> select header_block,header_file from dba_segments where segment_name='_SYSS
MU9$';
HEADER_BLOCK HEADER_FILE
------------ -----------
137 2
事務表儲存在 undo segment header file 2,block 137
SQL> alter system dump logfile 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\REDO01.L
og';
系統已更改。
REDO RECORD - Thread:1 RBA: 0x00003e.00000019.0010 LEN: 0x01d0 VLD: 0x0d
SCN: 0x0000.0047effc SUBSCN: 13 10/22/2009 14:05:25
CHANGE #1 TYP:2 CLS: 1 AFN:4 DBA:0x010001c4 OBJ:54147 SCN:0x0000.0047efa0 SEQ: 1 OP:11.5
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0009.005.0000058e uba: 0x0080020b.0209.26
Block cleanout record, scn: 0x0000.0047efe2 ver: 0x01 opt: 0x02, entries follow...
itli: 2 flg: 2 scn: 0x0000.0047efa0
KDO Op code: URP row dependencies Disabled
xtype: XA flags: 0x00000000 bdba: 0x010001c4 hdba: 0x010001c3
itli: 1 ispac: 0 maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 1 ckix: 8
ncol: 1 nnew: 1 size: 1
col 0: [ 3] 62 62 62
CHANGE #2 TYP:0 CLS:33 AFN:2 DBA:0x00800089 OBJ:4294967295 SCN:0x0000.0047efb5 SEQ: 2 OP:5.2
ktudh redo: slt: 0x0005 sqn: 0x0000058e flg: 0x0012 siz: 152 fbi: 0
uba: 0x0080020b.0209.26 pxid: 0x0000.000.00000000
CHANGE #3 TYP:0 CLS:34 AFN:2 DBA:0x0080020b OBJ:4294967295 SCN:0x0000.0047efb5 SEQ: 28 OP:5.1
ktudb redo: siz: 152 spc: 3380 flg: 0x0012 seq: 0x0209 rec: 0x26
xid: 0x0009.005.0000058e
ktubl redo: slt: 5 rci: 0 opc: 11.1 objn: 54147 objd: 54147 tsn: 4
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080020b.0209.0a
prev ctl max cmt scn: 0x0000.0047e801 prev tx cmt scn: 0x0000.0047e80c
txn start scn: 0x0000.0047ee52 logon user: 61 prev brb: 8388965 prev bcl: 0 KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0002.010.00000572 uba: 0x008006cc.04e3.1a
flg: C--- lkc: 0 scn: 0x0000.0047ea28
KDO Op code: URP row dependencies Disabled
xtype: XA flags: 0x00000000 bdba: 0x010001c4 hdba: 0x010001c3
itli: 1 ispac: 0 maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 8
ncol: 1 nnew: 1 size: -1
col 0: [ 2] 62 62
此時 commit
SQL> alter system dump logfile 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\XHTEST\REDO01.L
og';
系統已更改。
SQL> commit;
檢視dump 多了一個 record
REDO RECORD - Thread:1 RBA: 0x00003e.000001c5.0010 LEN: 0x008c VLD: 0x05
SCN: 0x0000.0047f11a SUBSCN: 1 10/22/2009 14:06:59
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 OBJ:4294967295 SCN:0x0000.0047effc SEQ: 1 OP:5.4
ktucm redo: slt: 0x0005 sqn: 0x0000058e srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080020b.0209.26 ext: 2 spc: 3226 fbi: 0
這個 record 只有一個change vector 是 針對undo segment header的 當commit時記錄事務表tnb中 sta:9 表示提交
SQL> variable file# number;
SQL> variable blk# number;
SQL> execute :file#:=dbms_utility.data_block_address_file(to_number('800089','xx
xxxx'));
PL/SQL 過程已成功完成。
SQL> execute :blk#:=dbms_utility.data_block_address_block(to_number('800089','x
xxxxxxx'));
PL/SQL 過程已成功完成。
SQL> print file#
FILE#
----------
2
SQL> print block#
SP2-0552: 未宣告繫結變數 "BLOCK#"。
SQL> print blk#
BLK#
----------
137
如果要再進一步深入 可以 dump下 undo segment header 檢視下 事務表
state 9代表 提交 ,10代表active
index就是 slot號碼
dba :對應的undo block address
TRN TBL::
index state cflags wrap# uel scn dba parent-xid nub stmt_num cmt
------------------------------------------------------------------------------------------------
0x00 9 0x00 0x058e 0x0017 0x0000.0047ef60 0x0080020b 0x0000.000.00000000 0x00000001 0x00000000 1256191265
0x01 9 0x00 0x058e 0x0020 0x0000.0047ecce 0x00800166 0x0000.000.00000000 0x00000001 0x00000000 1256190197
.............................................................................................................................
0x2f 9 0x00 0x058d 0x000d 0x0000.0047ef0d 0x00800168 0x0000.000.00000000 0x00000002 0x00000000 1256191257
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