|Oracle® Database Backup and Recovery Reference
11g Release 2 (11.2)
|PDF · Mobi · ePub|
The target database instance must be started. The database must be a single-instance database and must not be a physical standby database.
Ensure that at most one RMAN session is running the
REPAIR FAILURE command. The only exception is
REPAIR FAILURE ... PREVIEW, which is permitted in concurrent RMAN sessions.
To perform an automated repair, the Data Recovery Advisor may require specific backups and archived redo log files. If the files needed for recovery are not available, then the recovery is not possible.
Repairs are consolidated whenever possible so that a single repair can fix multiple failures. Be advised that
REPAIR FAILURE requires you to explicitly run
ADVISE FAILURE in the current session to successfully repair each of the identified failures. You typically iterate through a
REPAIR session with the following commands:
RMAN always verifies that failures are still relevant and automatically closes fixed failures. RMAN does not attempt to repair a failure that has been fixed, nor does it repair a failure that is obsolete because new failures have been introduced since
ADVISE FAILURE was run.
REPAIR FAILURE prompts for confirmation before it begins executing. After executing a repair, RMAN reevaluates all existing failures on the chance that they may also have been fixed.
If a data failure brings down all instances of an Oracle RAC database, then you can mount the database in single-instance mode and use Data Recovery Advisor to detect and repair control file,
SYSTEM data file, and dictionary failures. You can also initiate health checks to test other database components for data failures. This approach does not detect data failures that are local to other cluster instances, for example, an inaccessible data file.
||Repairs failures recorded in the Automated Diagnostic Repository.
If you execute
||Specifies a repair option by its option number (not its failure number). You can obtain repair option numbers from the
||Suppresses the confirmation prompt.
This is the default option if you run
||Does not make any repairs and generates a script with all repair actions and comments. By default the script is displayed to standard output. You can use the
This example repairs all failures known to the Recovery Data Advisor. The example repairs two failures: missing data files and a data file with corrupt blocks. After the recovery, RMAN asks whether it should open the database (user-entered text is in bold).
RMAN> LIST FAILURE; List of Database Failures ========================= Failure ID Priority Status Time Detected Summary ---------- -------- --------- ------------- ------- 142 HIGH OPEN 23-APR-07 One or more non-system datafiles are missing 101 HIGH OPEN 23-APR-07 Datafile 1: '/disk1/oradata/prod/system01.dbf' contains one or more corrupt blocks RMAN> ADVISE FAILURE; List of Database Failures ========================= Failure ID Priority Status Time Detected Summary ---------- -------- --------- ------------- ------- 142 HIGH OPEN 23-APR-07 One or more non-system datafiles are missing 101 HIGH OPEN 23-APR-07 Datafile 1: '/disk1/oradata/prod/system01.dbf' contains one or more corrupt blocks analyzing automatic repair options; this may take some time using channel ORA_DISK_1 analyzing automatic repair options complete Mandatory Manual Actions ======================== no manual actions available Optional Manual Actions ======================= 1. If file /disk1/oradata/prod/users01.dbf was unintentionally renamed or moved, restore it Automated Repair Options ======================== Option Repair Description ------ ------------------ 1 Restore and recover datafile 28; Perform block media recovery of block 56416 in file 1 Strategy: The repair includes complete media recovery with no data loss Repair script: /disk1/oracle/log/diag/rdbms/prod/prod/hm/reco_660500184.hm RMAN> REPAIR FAILURE; Strategy: The repair includes complete media recovery with no data loss Repair script: /disk1/oracle/log/diag/rdbms/prod/prod/hm/reco_475549922.hm contents of repair script: # restore and recover datafile sql 'alter database datafile 28 offline'; restore datafile 28; recover datafile 28; sql 'alter database datafile 28 online'; # block media recovery recover datafile 1 block 56416; Do you really want to execute the above repair (enter YES or NO)? YES executing repair script sql statement: alter database datafile 28 offline Starting restore at 23-APR-07 using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile backup set restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set channel ORA_DISK_1: restoring datafile 00028 to /disk1/oradata/prod/users01.dbf channel ORA_DISK_1: reading from backup piece /disk2/PROD/backupset/2007_04_18/o1_mf_nnndf_TAG20070418T182042_32fjzd3z_.bkp channel ORA_DISK_1: piece handle=/disk2/PROD/backupset/2007_04_18/o1_mf_nnndf_TAG20070418T182042_32fjzd3z_.bkp tag=TAG20070418T182042 channel ORA_DISK_1: restored backup piece 1 channel ORA_DISK_1: restore complete, elapsed time: 00:00:03 Finished restore at 23-APR-07 Starting recover at 23-APR-07 using channel ORA_DISK_1 starting media recovery media recovery complete, elapsed time: 00:00:01 Finished recover at 23-APR-07 sql statement: alter database datafile 28 online Starting recover at 23-APR-07 using channel ORA_DISK_1 searching flashback logs for block images until SCN 429690 finished flashback log search, restored 1 blocks starting media recovery media recovery complete, elapsed time: 00:00:03 Finished recover at 23-APR-07 repair failure complete
The following example previews a repair of the first repair option of the most recent
ADVISE FAILURE command in the current session. The sample output for the
LIST FAILURE and
ADVISE FAILURE commands is not shown in the example.
RMAN> LIST FAILURE; . . . RMAN> ADVISE FAILURE; . . . RMAN> REPAIR FAILURE PREVIEW; Strategy: The repair includes complete media recovery with no data loss Repair script: /disk1/oracle/log/diag/rdbms/prod/prod/hm/reco_3200987003.hm contents of repair script: # block media recovery recover datafile 1 block 56416;
You can use
REPAIR FAILURE ... PREVIEW to write a repair script to a file. You can then edit this script and execute it manually. The following example spools a log a repair preview to
RMAN> SPOOL LOG TO '/tmp/repaircmd.dat'; RMAN> REPAIR FAILURE PREVIEW; RMAN> SPOOL LOG OFF;