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Don Burleson Blog 







RMAN crosscheck Tips

Oracle Database Tips by Donald BurlesonJanuary 4, 2015

Question:  I want to understand when to use the RMAN crosscheck command.  When do I use the RMAN crosscheck command?

Answer:  The RMAN crosscheck command is used when RMAN indicates that a file is "missing:

RMAN> crosscheck backuppiece xxx;

crosschecked backup piece: found to be 'EXPIRED'

backup piece handle=xxx

crosschecked 1 objects

As we see the RMAN crosscheck command compares the RMAN  catalog entries with the actual OS files and reports to locate "expired" or "obsolete" RMAN catalog entries.

Once a RMAN crosscheck identified expired, deleted on on obsolete catalog entries you can run an RMAN delete command to remove these entries to synchronize the RMAN catalog with the real database files:

RMAN> delete noprompt obsolete;

The RMAN crosscheck command can also be used to archive RMAN catalog entries:

crosscheck archivelog all ;

This crosscheck command is used then you get a RMAN-06059:

oracle> oerr RMAN 06059

RMAN-06059 expected archived log not found, loss of archived log compromises recoverability

Cause: The archived log was not found. The repository thinks it does exist. If the archived log has in fact been lost and there is no backup, then the database is no longer recoverable across the point in time covered by the archived log. This may occur because the archived log was removed by an outside utility without updating the repository.

Action: If the archived log has been removed with an outside utility and the archivelog has already been backed up, then you can synchronize the repository by running CROSSCHECK ARCHIVELOG ALL. If the archivelog has not been previously backed up, then you should take a full backup of the database and archivelogs to preserve recoverability. Previous backups are not fully recoverable.

 The syntax for the RMAN crosscheck command is simple:

allocate channel ch1 type disk ;
crosscheck archivelog all ;
release channel ch1 ;

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