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使用_allow_resetlogs_corruption打開無歸檔日志rman備份庫
rman還原恢復(fù)操作
--還原數(shù)據(jù)庫
RMAN> restore database;
--恢復(fù)數(shù)據(jù)庫
RMAN> recover database;
Starting recover at 2012-03-08 21:20:45
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=65 device type=DISK
starting media recovery
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 03/08/2012 21:20:47
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of archived log for thread 1 with sequence 2936 and starting SCN of 25991695 found to restore
RMAN-06025: no backup of archived log for thread 1 with sequence 2935 and starting SCN of 25991652 found to restore
RMAN-06025: no backup of archived log for thread 1 with sequence 2934 and starting SCN of 25991649 found to restore
……………………
RMAN-06025: no backup of archived log for thread 1 with sequence 2902 and starting SCN of 25991156 found to restore
這里報日志缺少，實際上是備份的數(shù)據(jù)庫文件后，沒有備份歸檔日志，歸檔日志全部丟失
進行不完全恢復(fù)
SQL> recover database until cancel;
ORA-00279: change 25991194 generated at 03/08/2012 20:33:58 needed for thread 1
ORA-00289: suggestion : /opt/oracle/oradata/archivelog/chf/1_2902_752334071.dbf
ORA-00280: change 25991194 for thread 1 is in sequence #2902
Specify log: {=suggested | filename | AUTO | CANCEL}
cancel
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: '/opt/oracle/oradata/chf/system01.dbf'
ORA-01112: media recovery not started
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: '/opt/oracle/oradata/chf/system01.dbf'
查看相關(guān)SCN
SQL> select file#,to_char(checkpoint_change#,'999999999999') from v$datafile;
FILE# TO_CHAR(CHECK
---------- -------------
1 25992214
2 25992214
3 25992214
4 25992214
5 25992214
6 25992214
7 25992214
8 25992214
9 25992214
10 25992214
11 25992214
FILE# TO_CHAR(CHECK
---------- -------------
13 25992214
14 25992214
13 rows selected.
SQL> select file#,online_status,to_char(change#,'999999999999') from v$recover_file;
FILE# ONLINE_ TO_CHAR(CHANG
---------- ------- -------------
1 ONLINE 25991194
2 ONLINE 25991194
3 ONLINE 25991194
4 ONLINE 25991194
5 ONLINE 25991194
6 ONLINE 25991194
7 ONLINE 25991194
8 ONLINE 25991194
9 ONLINE 25991194
10 ONLINE 25991194
11 ONLINE 25991194
FILE# ONLINE_ TO_CHAR(CHANG
---------- ------- -------------
13 ONLINE 25991194
14 ONLINE 25991194
13 rows selected.
SQL> select file#,to_char(checkpoint_change#,'999999999999') from v$datafile_header;
FILE# TO_CHAR(CHECK
---------- -------------
1 25991194
2 25991194
3 25991194
4 25991194
5 25991194
6 25991194
7 25991194
8 25991194
9 25991194
10 25991194
11 25991194
FILE# TO_CHAR(CHECK
---------- -------------
13 25991194
14 25991194
13 rows selected.
--發(fā)現(xiàn)數(shù)據(jù)文件scn和控制文件不一致，重建控制文件，然后查詢相關(guān)scn
SQL> select file#,to_char(checkpoint_change#,'999999999999') from v$datafile;
FILE# TO_CHAR(CHECK
---------- -------------
1 25991194
2 25991194
3 25991194
4 25991194
5 25991194
6 25991194
7 25991194
8 25991194
9 25991194
10 25991194
11 25991194
FILE# TO_CHAR(CHECK
---------- -------------
13 25991194
14 25991194
13 rows selected.
SQL> select file#,online_status,to_char(change#,'999999999999') from v$recover_file;
FILE# ONLINE_ TO_CHAR(CHANG
---------- ------- -------------
1 ONLINE 25991194
2 ONLINE 25991194
3 ONLINE 25991194
4 ONLINE 25991194
5 ONLINE 25991194
6 ONLINE 25991194
7 ONLINE 25991194
8 ONLINE 25991194
9 ONLINE 25991194
10 ONLINE 25991194
11 ONLINE 25991194
FILE# ONLINE_ TO_CHAR(CHANG
---------- ------- -------------
13 ONLINE 25991194
14 ONLINE 25991194
13 rows selected.
SQL> select file#,to_char(checkpoint_change#,'999999999999') from v$datafile_header;
FILE# TO_CHAR(CHECK
---------- -------------
1 25991194
2 25991194
3 25991194
4 25991194
5 25991194
6 25991194
7 25991194
8 25991194
9 25991194
10 25991194
11 25991194
FILE# TO_CHAR(CHECK
---------- -------------
13 25991194
14 25991194
13 rows selected.
--此時所有scn均一致
嘗試打開數(shù)據(jù)庫
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: '/opt/oracle/oradata/chf/system01.dbf'
SQL> recover database using backup controlfile until cancel;
ORA-00279: change 25991194 generated at 03/08/2012 20:33:58 needed for thread 1
ORA-00289: suggestion : /opt/oracle/oradata/archivelog/chf/1_2902_752334071.dbf
ORA-00280: change 25991194 for thread 1 is in sequence #2902
Specify log: {=suggested | filename | AUTO | CANCEL}
cancel
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: '/opt/oracle/oradata/chf/system01.dbf'
ORA-01112: media recovery not started
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: '/opt/oracle/oradata/chf/system01.dbf'
使用隱含參數(shù)打開數(shù)據(jù)庫
SQL> create pfile='/tmp/pfile' from spfile;
File created.
-------/tmp/pfile中加上----------
_allow_resetlogs_corruption= TRUE
---------------------------------
SQL> startup mount pfile='/tmp/pfile' force
ORACLE instance started.
Total System Global Area 622149632 bytes
Fixed Size 2230912 bytes
Variable Size 419431808 bytes
Database Buffers 192937984 bytes
Redo Buffers 7548928 bytes
Database mounted.
SQL> alter database open resetlogs;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
總結(jié)
這次的試驗沒有多少實際意義，但是可以說明幾個問題：
1.所有的數(shù)據(jù)文件的scn都一致，甚至和控制文件的也一致，數(shù)據(jù)庫不一定可以open成功
(懷疑是數(shù)據(jù)文件中的scn大于data header scn)
2.對于這樣的問題，如果使用bbed修改所有數(shù)據(jù)文件header的scn不知道是否可以解決
3.如果rman只備份了數(shù)據(jù)文件而沒有任何一個歸檔日志，數(shù)據(jù)庫通過隱含參數(shù)還是可以open，搶救數(shù)據(jù) |
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發(fā)表于 2016-06-02 15:27