[20180413]熱備模式相關問題2.txt
[20180413]熱備模式相關問題2.txt
--//上午測試熱備模式相關問題,就是如果開啟熱備模式,如果中間的歸檔丟失,oracle在alter database end backup ;時並沒有應用日誌.
--//雖然熱備份模式檔案頭scn被"凍結",一定在某個地方記錄的檢查點的scn,這樣在執行alter database end backup ;時,寫入新的scn
--//這樣在恢復時才有可能跳過一些丟失的歸檔.
--//從某種意義講,oracle這樣設計有一定道理,假設某種情況開啟熱備模式,由於熱備模式中斷或者沒有完成,忘記結束,如果在某次異常關閉時
--//需要恢復,並需要從"凍結"的scn號開始恢復.
--//測試看看這些相關資訊儲存在那裡.
1.環境:
SCOTT@book> @ ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
2.測試1:
SYS@book> alter tablespace tea begin backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277609065 2018-04-13 09:38:45 7 925702 ONLINE 937 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277634716 2018-04-13 15:02:36 13276257767 925702 ONLINE 309 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> alter tablespace tea end backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277609065 2018-04-13 09:38:45 7 925702 ONLINE 937 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277634716 2018-04-13 15:02:36 13276257767 925702 ONLINE 310 YES /mnt/ramdisk/book/tea01.dbf TEA
--//資料檔案6的scn=13277634716,沒有變化,CHECKPOINT_COUNT增加.
3.測試2:
SYS@book> alter tablespace tea begin backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277609065 2018-04-13 09:38:45 7 925702 ONLINE 937 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277634864 2018-04-13 15:04:47 13276257767 925702 ONLINE 311 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> alter system checkpoint ;
System altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277634878 2018-04-13 15:04:56 7 925702 ONLINE 938 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277634864 2018-04-13 15:04:47 13276257767 925702 ONLINE 312 YES /mnt/ramdisk/book/tea01.dbf TEA
--//雖然資料檔案6呃檔案頭scn被凍結13277634864,但是CHECKPOINT_COUNT依舊還是增加,也就是還是會改動檔案頭資訊.
select 13277634878,trunc(13277634878/power(2,32)) scn_wrap,mod(13277634878,power(2,32)) scn_base from dual
13277634878 SCN_WRAP SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277634878 3 392732990 3 1768a13e
SYS@book> @ &r/10to16 392732990
10 to 16 HEX REVERSE16
----------------- -----------------------------------
000000001768a13e 0x3ea16817-00000000
--//透過bbed觀察,可以發出檢查點資訊是記錄在檔案頭中的.
BBED> p dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 0x1768a13e
ub2 kscnwrp @156 0x0003
SYS@book> alter system checkpoint ;
System altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
1 13277635895 2018-04-13 15:13:16 7 925702 ONLINE 939 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277634864 2018-04-13 15:04:47 13276257767 925702 ONLINE 313 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> @ &r/10to16 13277635895
10 to 16 HEX REVERSE16
----------------- -----------------------------------
000000031768a537 0x37a56817-03000000
BBED> p dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 0x1768a537
ub2 kscnwrp @156 0x0003
--//可以發現資料檔案6kcvfh.kcvfhbcp.kcvcpscn位置也會更新.這樣在結束熱備模式時,自動更新檔案頭.
SYS@book> alter tablespace tea end backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
1 13277635895 2018-04-13 15:13:16 7 925702 ONLINE 939 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277635895 2018-04-13 15:13:16 13276257767 925702 ONLINE 314 YES /mnt/ramdisk/book/tea01.dbf TEA
--//這也就很好解析為什麼結束熱備模式,從那裡更新檢查點.另外kcvfh.kcvfhbcp.kcvcpscn,裡面的hb可以猜測表示hot backup的意思.
4.測試3:
--//做一個檔案頭轉儲看看:
SYS@book> alter tablespace tea begin backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
1 13277635895 2018-04-13 15:13:16 7 925702 ONLINE 939 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277637553 2018-04-13 15:39:15 13276257767 925702 ONLINE 317 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> alter system checkpoint ;
System altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ---------------------------------------------------- ------------------------------
1 13277637599 2018-04-13 15:39:56 7 925702 ONLINE 940 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277637553 2018-04-13 15:39:15 13276257767 925702 ONLINE 318 YES /mnt/ramdisk/book/tea01.dbf TEA
select 13277637599,trunc(13277637599/power(2,32)) scn_wrap,mod(13277637599,power(2,32)) scn_base from dual
13277637599 SCN_WRAP SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277637599 3 392735711 3 1768abdf
select 13277637553,trunc(13277637553/power(2,32)) scn_wrap,mod(13277637553,power(2,32)) scn_base from dual
13277637553 SCN_WRAP SCN_BASE SCN_WRAP16 SCN_BASE16
------------ ------------ ------------ ---------- ----------
13277637553 3 392735665 3 1768abb1
SYS@book> alter session set events 'immediate trace name FILE_HDRS level 12';
Session altered.
--//檢查轉儲:
DATA FILE #6:
name #10: /mnt/ramdisk/book/tea01.dbf
creation size=5120 block size=8192 status=0xe head=10 tail=10 dup=1
tablespace 7, index=7 krfil=6 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:318 scn: 0x0003.1768abb1 04/13/2018 15:39:15
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// --> 注這裡的資訊來之控制檔案:http://blog.itpub.net/267265/viewspace-2136766/
Stop scn: 0xffff.ffffffff 04/13/2018 09:38:22
Creation Checkpointed at scn: 0x0003.17539de7 02/13/2017 15:09:58
thread:1 rba:(0x1d6.48.10)
enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000
Offline scn: 0x0000.00000000 prev_range: 0
Online Checkpointed at scn: 0x0000.00000000
thread:0 rba:(0x0.0.0)
enabled threads: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000
Hot Backup end marker scn: 0x0000.00000000
aux_file is NOT DEFINED
Plugged readony: NO
Plugin scnscn: 0x0000.00000000
Plugin resetlogs scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Foreign creation scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Foreign checkpoint scn/timescn: 0x0000.00000000 01/01/1988 00:00:00
Online move state: 0
V10 STYLE FILE HEADER:
Compatibility Vsn = 186647552=0xb200400
Db ID=1337401710=0x4fb7216e, Db Name='BOOK'
Activation ID=0=0x0
Control Seq=39840=0x9ba0, File size=5120=0x1400
File Number=6, Blksiz=8192, File Type=3 DATA
Tablespace #7 - TEA rel_fn:6
Creation at scn: 0x0003.17539de7 02/13/2017 15:09:58
Backup taken at scn: 0x0003.1768abb1 04/13/2018 15:39:15 thread:1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--//發出熱備份模式的scn資訊.
reset logs count:0x35711eb0 scn: 0x0000.000e2006
prev reset logs count:0x3121c97a scn: 0x0000.00000001
recovered at 04/13/2018 09:38:35
status:0x1 root dba:0x00000000 chkpt cnt: 318 ctl cnt:317
begin-hot-backup file size: 5120
Checkpointed at scn: 0x0003.1768abb1 04/13/2018 15:39:15
thread:1 rba:(0x2f7.a85b.10)
enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000
Backup Checkpointed at scn: 0x0003.1768abdf 04/13/2018 15:39:56
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--//備份過程中發出的檢查點資訊.
thread:1 rba:(0x2f7.a886.10)
enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000
External cache id: 0x0 0x0 0x0 0x0
Absolute fuzzy scn: 0x0000.00000000
Recovery fuzzy scn: 0x0000.00000000 01/01/1988 00:00:00
Terminal Recovery Stamp 01/01/1988 00:00:00
Platform Information: Creation Platform ID: 13
Current Platform ID: 13 Last Platform ID: 13
DUMP OF TEMP FILES: 1 files in database
5.繼續測試,使用bbed修改看看:
--//使用bbed修改看看,減少kcvfh.kcvfhbcp.kcvcpscn-11看看.
SYS@book> shutdown abort ;
ORACLE instance shut down.
--//使用bbed修改:
BBED> p /d dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 392735711
ub2 kscnwrp @156 3
BBED> assign dba 6,1 kcvfh.kcvfhbcp.kcvcpscn.kscnbas=392735700
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
ub4 kscnbas @152 0x1768abd4
BBED> sum apply dba 6,1
Check value for File 6, Block 1:
current = 0xcf4c, required = 0xcf4c
BBED> p dba 6,1 kcvfh.kcvfhbcp.kcvcpscn
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 0x1768abd4
ub2 kscnwrp @156 0x0003
SYS@book> @ &r/16to10 31768abd4
16 to 10 DEC
------------
13277637588
--//減少到13277637588.
SYS@book> startup
ORACLE instance started.
Total System Global Area 634732544 bytes
Fixed Size 2255792 bytes
Variable Size 197133392 bytes
Database Buffers 427819008 bytes
Redo Buffers 7524352 bytes
Database mounted.
ORA-10873: file 6 needs to be either taken out of backup mode or media recovered
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277637599 2018-04-13 15:39:56 7 925702 ONLINE 941 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277637553 2018-04-13 15:39:15 13276257767 925702 ONLINE 318 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> alter tablespace tea end backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277637599 2018-04-13 15:39:56 7 925702 ONLINE 941 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277637588 2018-04-13 15:39:56 13276257767 925702 ONLINE 319 YES /mnt/ramdisk/book/tea01.dbf TEA
--//與前面修改一致,也驗證了自己的判斷.
6.繼續測試,是否在熱備份模式可以offline表空間:
SYS@book> alter database open ;
Database altered.
SYS@book> alter tablespace tea begin backup ;
Tablespace altered.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file# in (1,6);
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- -------------------------------------------------- ------------------------------
1 13277658196 2018-04-13 15:56:09 7 925702 ONLINE 944 YES /mnt/ramdisk/book/system01.dbf SYSTEM
6 13277658833 2018-04-13 15:59:49 13276257767 925702 ONLINE 329 YES /mnt/ramdisk/book/tea01.dbf TEA
SYS@book> alter tablespace tea offline;
alter tablespace tea offline
*
ERROR at line 1:
ORA-01150: cannot prevent writes - file 6 has online backup set
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'
$ oerr ora 01150
01150, 00000, "cannot prevent writes - file %s has online backup set"
// *Cause: An attempt to make a tablespace read only or offline normal found
// that an online backup is still in progress. It will be necessary
// to write the file header to end the backup, but that would not
// be allowed if this command succeeded.
// *Action: End the backup of the offending tablespace and retry this command.
SYS@book> alter tablespace tea offline immediate ;
Tablespace altered.
--//強制ok.
SYS@book> alter tablespace tea online;
alter tablespace tea online
*
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/mnt/ramdisk/book/tea01.dbf'
SYS@book> select * from v$backup where file# in (1,6);
FILE# STATUS CHANGE# TIME
----- ------------------ ------------ -------------------
1 NOT ACTIVE 13277525910 2018-04-13 09:03:44
6 NOT ACTIVE 13277658833 2018-04-13 15:59:49
--//熱備模式已經關閉.
--//總結:
--//雖然熱備份已經不常用,也不推薦使用.還是佩服oracle設計時的考慮周全,在發出檢查點時記錄最新的scn號資料檔案中即使在熱備份模式下.
--//這樣在恢復時減少使用歸檔的數量.
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/267265/viewspace-2152909/，如需轉載，請註明出處，否則將追究法律責任。
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