oracle redo 200mb,Oracle的redo log在各场景下的恢复
Oracle的redo log非常重要，redo log損壞將導(dǎo)致數(shù)據(jù)庫開法開啟或數(shù)據(jù)丟失，針對(duì)redo log在各種場景下如何打開或恢復(fù)數(shù)據(jù)庫，特別模擬測試說明：
各場景包括如下(共6個(gè)場景):
場景一.非歸檔下inactive狀態(tài)的redo 恢復(fù)
場景二.非歸檔下active狀態(tài)的redo 恢復(fù)
場景三.非歸檔下current狀態(tài)的redo恢復(fù)
場景四.歸檔模式下inactive狀態(tài)的redo 恢復(fù)
場景五.歸檔模式下的active狀態(tài)的redo 恢復(fù)
場景六.歸檔模式下的current狀態(tài)的redo恢復(fù)
oracle版本為oracle 11.1.0.7
各場景恢復(fù)操作如下：
一.非歸檔下inactive狀態(tài)的redo 恢復(fù)
session 1:
查看歸檔模式：---非歸檔
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination /kttest1-1_data1/emsdev/arch
Oldest online log sequence 3
Current log sequence 8
查看log情況：
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 10 104857600 1 NO INACTIVE 1.2790E+13 30-MAY-14
2 1 13 104857600 1 NO CURRENT 1.2790E+13 30-MAY-14
3 1 12 104857600 1 NO ACTIVE 1.2790E+13 30-MAY-14
SQL> col member for a70
SQL> select * from v$logfile;
GROUP# STATUS TYPE MEMBER
---------- ------- ------- ----------------------------------------------------------------------
IS_
---
3 ONLINE /kttest1-1_data1/emsdev/redo03.dbf
NO
1 ONLINE /kttest1-1_data1/emsdev/redo01.dbf
NO
2 ONLINE /kttest1-1_data1/emsdev/redo02.dbf
NO
SQL> alter system checkpoint;
System altered.
SQL> alter system checkpoint;
System altered.
session 2:
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo02.dbf bs=512 count=10
0+0 records in
0+0 records out
session 1:
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 23 104857600 1 NO INACTIVE
1.2792E+13 03-JUN-14
2 1 22 104857600 1 NO INACTIVE
1.2792E+13 02-JUN-14
3 1 24 104857600 1 NO CURRENT
1.2792E+13 03-JUN-14
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00320: cannot read file header from log 2 of thread 1
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> alter database clear logfile group 2;
Database altered.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-00320: cannot read file header from log 2 of thread 1
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> alter database drop logfile group 2;
Database altered.
SQL> alter database open;
Database altered.
SQL> alter database add logfile group 2 ('/kttest1-1_data1/emsdev/redo02.dbf') size 100m;
alter database add logfile group 2 ('/kttest1-1_data1/emsdev/redo02.dbf') size 300m
*
ERROR at line 1:
ORA-00301: error in adding log file '/kttest1-1_data1/emsdev/redo02.dbf' - file
cannot be created
ORA-27038: created file already exists
Additional information: 1
SQL> alter database add logfile group 2 ('/kttest1-1_data1/emsdev/redo02.dbf') size 100m reuse;
Database altered.
二.非歸檔下active狀態(tài)的redo 恢復(fù)
如果非current redo 損壞，但是包含active事務(wù)，那么情況完全不同。
----Session 1
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 26 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
2 1 25 314572800 1 NO ACTIVE
1.2792E+13 04-JUN-14
3 1 24 104857600 1 NO INACTIVE
1.2792E+13 03-JUN-14
SQL> col member for a70
SQL> select * from v$logfile;
GROUP# STATUS TYPE
---------- ------- -------
MEMBER IS_
---------------------------------------------------------------------- ---
3 ONLINE
/kttest1-1_data1/emsdev/redo03.dbf NO
1 ONLINE
/kttest1-1_data1/emsdev/redo01.dbf NO
2 ONLINE
/kttest1-1_data1/emsdev/redo02.dbf NO
session 2:
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo02.dbf bs=512 count=10
0+0 records in
0+0 records out
---Session 1
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 26 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
2 1 25 314572800 1 NO ACTIVE
1.2792E+13 04-JUN-14
3 1 24 104857600 1 NO INACTIVE
1.2792E+13 03-JUN-14
SQL>SQL> shutdown abort
ORACLE instance shut down.
SQL> select * from v$log;
select * from v$log
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 3544
Session ID: 83 Serial number: 3
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00320: cannot read file header from log 2 of thread 1
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
ORA-27069: attempt to do I/O beyond the range of the file
Additional information: 1
Additional information: 1
SQL> alter database clear logfile group 2;
alter database clear logfile group 2
*
ERROR at line 1:
ORA-01624: log 2 needed for crash recovery of instance emsdev1 (thread 1)
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> alter database drop logfile group 2;
alter database drop logfile group 2
*
ERROR at line 1:
ORA-01624: log 2 needed for crash recovery of instance emsdev1 (thread 1)
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> recover database until cancel;
ORA-00279: change 12792226234738 generated at 06/04/2014 09:35:35 needed for
thread 1
ORA-00289: suggestion : /kttest1-1_data1/emsdev/arch/1_32_848646308.arch
ORA-00280: change 12792226234738 for thread 1 is in sequence #32
Specify log: {=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_32_848646308.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_32_848646308.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/kttest1-1_data1/emsdev/system01.dbf'
32沒有歸檔，不能這樣恢復(fù)
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 32 104857600 1 NO ACTIVE
1.2792E+13 04-JUN-14
3 1 34 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
2 1 33 104857600 1 NO ACTIVE
1.2792E+13 04-JUN-14
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/kttest1-1_data1/emsdev/system01.dbf'
SQL> show parameter pfile
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string
SQL> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL>
在pfile文件中加入兩個(gè)參數(shù)：
*._allow_resetlogs_corruption=true
*._allow_error_simulation=true ----從oracle 10g開始，引入的另外一個(gè)參數(shù)。
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup mount
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
SQL> alter database open resetlogs;
Database altered.
SQL> alter system switch logfile;
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> /
System altered.
三.非歸檔下current狀態(tài)的redo恢復(fù)
session 1:
SQL> create table test as select * from dba_extents;
Table created.
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 1 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
2 1 0 104857600 1 YES UNUSED
0
3 1 0 104857600 1 YES UNUSED
session 2 :
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo01.dbf bs=512 count=10
0+0 records in
0+0 records out
session 1:
SQL> delete from test where rownum <100000;
45074 rows deleted.
SQL> commit;
Commit complete.
SQL> shutdown immediate
ORA-03113: end-of-file on communication channel
Process ID: 14382
Session ID: 83 Serial number: 3
SQL> startup
ORA-24324: service handle not initialized
ORA-01041: internal error. hostdef extension doesn't exist
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00316: log 1 of thread 1, type 0 in header is not log file
ORA-00312: online log 1 thread 1: '/kttest1-1_data1/emsdev/redo01.dbf'
SQL> recover database until cancel;
ORA-00279: change 12792226263763 generated at 06/04/2014 10:45:34 needed for
thread 1
ORA-00289: suggestion : /kttest1-1_data1/emsdev/arch/1_1_849350732.arch
ORA-00280: change 12792226263763 for thread 1 is in sequence #1
Specify log: {=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_1_849350732.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_1_849350732.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/kttest1-1_data1/emsdev/system01.dbf'
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/kttest1-1_data1/emsdev/system01.dbf'
在pfile文件中加入兩個(gè)參數(shù)：
*._allow_resetlogs_corruption=true
*._allow_error_simulation=true
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;
Database altered.
如果無法直接open resetlogs打開的話，要檢查一下alert.log報(bào)錯(cuò)：
Thu Jul 18 16:38:42 2013
SMON: enabling cache recovery
Thu Jul 18 16:38:43 2013
Errors in file /oracle/admin/orcl/udump/orcl_ora_11149.trc:
ORA-00600: internal error code, arguments: [2662], [0], [4099916], [0], [4100136], [4194313], [], []
Thu Jul 18 16:38:43 2013
Error 600 happened during db open, shutting down database
USER: terminating instance due to error 600
Instance terminated by USER, pid = 11149
ORA-1092 signalled during: alter database open resetlogs...
如出現(xiàn)ora-00600 [2662]報(bào)錯(cuò)，需要推進(jìn)scn。推進(jìn)方法如下：
ORA-600 [2662] [a] [b] [c] [d] [e]
Arg [a] Current SCN WRAP
Arg [b] Current SCN BASE
Arg [c] dependent SCN WRAP
Arg [d] dependent SCN BASE
Arg [e] Where present this is the DBA where the dependent SCN came from.
算法計(jì)算規(guī)則如下：Arg [c]*4得出一個(gè)數(shù)值，假設(shè)為V_Wrap,
如果Arg [d]=0，則V_Wrap值為需要的level
Arg [d] < 1073741824，V_Wrap+1為需要的level
Arg [d] < 2147483648，V_Wrap+2為需要的level
Arg [d] < 3221225472，V_Wrap+3為需要的level
數(shù)據(jù)庫處于mount狀態(tài)下，執(zhí)行:alter session set events '10015 trace name adjust_scn level 1';
再alter database open;
可以檢查v$datafile與v$datafile_header的substr(checkpoint_change#,1,14)大小相同
四.歸檔模式下的red log恢復(fù)
1)inactive logfile損壞的情況
session 1:
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 4 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
2 1 2 104857600 1 YES INACTIVE
1.2792E+13 04-JUN-14
3 1 3 104857600 1 YES INACTIVE
1.2792E+13 04-JUN-14
SQL> col member for a70
SQL> select * from v$logfile;
GROUP# STATUS TYPE
---------- ------- -------
MEMBER IS_
---------------------------------------------------------------------- ---
3 ONLINE
/kttest1-1_data1/emsdev/redo03.dbf NO
1 ONLINE
/kttest1-1_data1/emsdev/redo01.dbf NO
2 ONLINE
/kttest1-1_data1/emsdev/redo02.dbf NO
session 2:
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo03.dbf bs=512 count=10
0+0 records in
0+0 records out
在這一步，如果不將數(shù)據(jù)庫進(jìn)行shutdown，繼續(xù)進(jìn)行l(wèi)ogfile的切換，那么redo03仍然是可以寫的，然而存在潛在風(fēng)險(xiǎn)。
session 1:
SQL> shutdown abort
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00320: cannot read file header from log 3 of thread 1
ORA-00312: online log 3 thread 1: '/kttest1-1_data1/emsdev/redo03.dbf'
SQL> alter database clear logfile group 3;
Database altered.
SQL> alter database drop logfile group 3;
Database altered.
SQL> alter database add logfile group 3 ('/kttest1-1_data1/emsdev/redo03.dbf') size 100m reuse;
Database altered.
SQL> alter database open; ++++ 這里地方由于原來舊有的redo03被進(jìn)程持有，可能句柄未釋放，所以仍然報(bào)錯(cuò)，重啟實(shí)例即可.
alter database open
*
ERROR at line 1:
ORA-00320: cannot read file header from log 3 of thread 1
ORA-00312: online log 3 thread 1: '/kttest1-1_data1/emsdev/redo03.dbf'
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
Database opened.
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS
---------- ---------- ---------- ---------- ---------- --- ----------------
FIRST_CHANGE# FIRST_TIM
------------- ---------
1 1 4 104857600 1 YES INACTIVE
1.2792E+13 04-JUN-14
2 1 2 104857600 1 YES INACTIVE
1.2792E+13 04-JUN-14
3 1 5 104857600 1 NO CURRENT
1.2792E+13 04-JUN-14
SQL> alter system switch logfile;
System altered.
2. 歸檔模式下current logfile損壞
場景一：
session 1:
SQL> set line 200
SQL> col member for a30
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 4 104857600 1 YES INACTIVE 1.2792E+13 04-JUN-14
2 1 6 104857600 1 NO CURRENT 1.2792E+13 04-JUN-14
3 1 5 104857600 1 YES INACTIVE 1.2792E+13 04-JUN-14
SQL> select * from v$logfile;
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- ------------------------------ ---
3 ONLINE /kttest1-1_data1/emsdev/redo03 NO
.dbf
1 ONLINE /kttest1-1_data1/emsdev/redo01 NO
.dbf
2 ONLINE /kttest1-1_data1/emsdev/redo02 NO
.dbf
session 2:
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo02.dbf bs=512 count=10
0+0 records in
0+0 records out
session 1:
SQL> shutdown immediate
ORA-03113: end-of-file on communication channel
Process ID: 15430
Session ID: 74 Serial number: 1
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00316: log 2 of thread 1, type 0 in header is not log file
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 4 104857600 1 YES INACTIVE 1.2792E+13 04-JUN-14
3 1 5 104857600 1 YES INACTIVE 1.2792E+13 04-JUN-14
2 1 6 104857600 1 NO CURRENT 1.2792E+13 04-JUN-14
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
在pfile文件中加入兩個(gè)參數(shù)：
*._allow_resetlogs_corruption=true
*._allow_error_simulation=true
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> recover database until cancel;
ORA-00279: change 12792226298118 generated at 06/04/2014 14:21:06 needed for
thread 1
ORA-00289: suggestion : /kttest1-1_data1/emsdev/arch/1_6_849351843.arch
ORA-00280: change 12792226298118 for thread 1 is in sequence #6
Specify log: {=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_6_849351843.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log
'/kttest1-1_data1/emsdev/arch/1_6_849351843.arch'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/kttest1-1_data1/emsdev/system01.dbf'
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
Process ID: 16850
Session ID: 166 Serial number: 3
檢查alert.log發(fā)現(xiàn)如下報(bào)錯(cuò)：
Errors in file /oracle/emsdev/diag/rdbms/emsdev1/emsdev1/trace/emsdev1_ora_16850.trc (incident=107308):
ORA-00600: internal error code, arguments: [2662], [2978], [1813690638], [2978], [1813691502], [4194432], [], [], [], [], [], []
Incident details in: /oracle/emsdev/diag/rdbms/emsdev1/emsdev1/incident/incdir_107308/emsdev1_ora_16850_i107308.trc
Wed Jun 04 14:38:11 2014
Errors in file /oracle/emsdev/diag/rdbms/emsdev1/emsdev1/trace/emsdev1_ora_16850.trc:
ORA-00600: internal error code, arguments: [2662], [2978], [1813690638], [2978], [1813691502], [4194432], [], [], [], [], [], []
Error 600 happened during db open, shutting down database
USER (ospid: 16850): terminating the instance due to error 600
Instance terminated by USER, pid = 16850
ORA-1092 signalled during: alter database open resetlogs...
ORA-1092 : opiodr aborting process unknown ospid (16850_1)
Wed Jun 04 14:38:15 2014
ORA-1092 : opitsk aborting process
/* 如出現(xiàn)ora-00600 [2662]報(bào)錯(cuò)，需要推進(jìn)scn。推進(jìn)方法如下：
ORA-600 [2662] [a] [b] [c] [d] [e]
Arg [a] Current SCN WRAP
Arg [b] Current SCN BASE
Arg [c] dependent SCN WRAP
Arg [d] dependent SCN BASE
Arg [e] Where present this is the DBA where the dependent SCN came from.
算法計(jì)算規(guī)則如下：Arg [c]*4得出一個(gè)數(shù)值，假設(shè)為V_Wrap,
如果Arg [d]=0，則V_Wrap值為需要的level
Arg [d] < 1073741824，V_Wrap+1為需要的level
Arg [d] < 2147483648，V_Wrap+2為需要的level
Arg [d] < 3221225472，V_Wrap+3為需要的level
數(shù)據(jù)庫處于mount狀態(tài)下，執(zhí)行:alter session set events '10015 trace name adjust_scn level 1';
再alter database open;
可以檢查v$datafile與v$datafile_header的substr(checkpoint_change#,1,14)大小相同 */
按以上方法計(jì)算出需要推進(jìn)的scn大小為11914
session 1:
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup mount
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
SQL> alter session set events '10015 trace name adjust_scn level 11914';
Session altered.
SQL> select substr(checkpoint_change#,1,14) as df_scn from v$datafile;
DF_SCN
--------------------------------------------------------
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
DF_SCN
--------------------------------------------------------
12792226298122
12792226298122
13 rows selected.
SQL> select substr(checkpoint_change#,1,14) as dfh_scn from v$datafile;
DFH_SCN
--------------------------------------------------------
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
12792226298122
DFH_SCN
--------------------------------------------------------
12792226298122
12792226298122
13 rows selected.
SQL> alter database open;
Database altered.
場景二：
+++++Session 1
SQL> conn /as sysdba
Connected.
SQL> set lines 200
SQL> col member for a60
SQL> select * from v$Log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 7 10485760 1 NO CURRENT 1073767933 22-JUL-13
2 1 5 10485760 1 YES INACTIVE 1073742213 21-JUL-13
3 1 6 52428800 1 YES INACTIVE 1073742215 21-JUL-13
SQL> select * from v$logfile;
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- ------------------------------------------------------------ ---
2 ONLINE /home/ora10g/oradata/roger/redo02.log NO
3 ONLINE /home/ora10g/oradata/roger/redo03.log NO
1 ONLINE /home/ora10g/oradata/roger/redo01.log NO
SQL>
SQL> alter system switch logfile;
System altered.
++++Session 2
[ora10g@killdb ~]$ dd if=/dev/null of=/home/ora10g/oradata/roger/redo02.log bs=512 count=10
0+0 records in
0+0 records out
++++Session 1
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1272600 bytes
Variable Size 96470248 bytes
Database Buffers 67108864 bytes
Redo Buffers 2920448 bytes
Database mounted.
ORA-00327: log 2 of thread 1, physical size less than needed
ORA-00312: online log 2 thread 1: '/home/ora10g/oradata/roger/redo02.log'
SQL> select * from v$Log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 7 10485760 1 YES INACTIVE 1073767933 22-JUL-13
3 1 6 52428800 1 YES INACTIVE 1073742215 21-JUL-13
2 1 8 10485760 1 NO CURRENT 1073770766 22-JUL-13
SQL> recover database until cancel;
Media recovery complete.
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-00327: log 2 of thread 1, physical size less than needed
ORA-00312: online log 2 thread 1: '/home/ora10g/oradata/roger/redo02.log'
在pfile文件中加入兩個(gè)參數(shù)：
*._allow_resetlogs_corruption=true
*._allow_error_simulation=true
SQL> startup mount pfile='/tmp/pfile.ora';
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1272600 bytes
Variable Size 96470248 bytes
Database Buffers 67108864 bytes
Redo Buffers 2920448 bytes
Database mounted.
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery
SQL> recover database until cancel;
ORA-00283: recovery session canceled due to errors
ORA-00600: internal error code, arguments: [2130], [0], [8], [2], [], [], [], []
SQL> show parameter resetlog
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
_allow_resetlogs_corruption boolean TRUE
SQL> show parameter allow
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
_allow_error_simulation boolean TRUE
_allow_resetlogs_corruption boolean TRUE
SQL> alter database open;
Database altered.
SQL>
SQL> alter system switch logfile;
System altered.
3. 歸檔模式下active logfile損壞
場景一：
session 1:
SQL> set line 300
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 1 104857600 1 YES INACTIVE 1.2793E+13 04-JUN-14
2 1 2 104857600 1 NO CURRENT 1.2793E+13 04-JUN-14
3 1 0 104857600 1 YES UNUSED 0
SQL> alter system switch logfile;
System altered.
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 1 104857600 1 YES INACTIVE 1.2793E+13 04-JUN-14
2 1 2 104857600 1 YES ACTIVE 1.2793E+13 04-JUN-14
3 1 3 104857600 1 NO CURRENT 1.2794E+13 04-JUN-14
session 2:
root@kttest1-1 # dd if=/dev/null of=/kttest1-1_data1/emsdev/redo02.dbf bs=512 count=10
0+0 records in
0+0 records out
session 1:
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 3207790592 bytes
Fixed Size 2119072 bytes
Variable Size 381586016 bytes
Database Buffers 2818572288 bytes
Redo Buffers 5513216 bytes
Database mounted.
ORA-00320: cannot read file header from log 2 of thread 1
ORA-00312: online log 2 thread 1: '/kttest1-1_data1/emsdev/redo02.dbf'
SQL> alter database clear logfile group 2;
Database altered.
SQL> alter database drop logfile group 2;
Database altered.
SQL> alter database open;
Database altered.
SQL> alter database add logfile group 2 ('/kttest1-1_data1/emsdev/redo02.dbf') size 100m reuse;
Database altered.
場景二：
恢復(fù)方法與非歸檔模式下的active redo log恢復(fù)相同
總結(jié)
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