Cross-Checking Backups - wykład

Cross-Checking Backups
Cross-checking a backup synchronizes the physical reality of backups with their
logical records in the RMAN repository. For example, if a backup on disk was deleted
with an operating system command, then a cross-check detects this condition. After
the cross-check, the RMAN repository correctly reflects the state of the backups.
Backups to disk are listed as available if they are still on disk in the location listed in
the RMAN repository, and if they have no corruption in the file header. Backups on
tape are listed as available if they are still on tape. The file headers on tape are not
checked for corruption. Backups that are missing or corrupt are listed as expired.
To cross-check individual files:
1. Connect RMAN to the target database as described in "Connecting to the Target
Database" on page 9-9.
2. Display a summary of the existing backups to determine which backup you want
to cross-check.
LIST BACKUP SUMMARY;
3. Identify the backup that you want to cross-check from the output of the previous
LIST command.
4. Cross-check the identified file using the CROSSCHECK command.
■ To cross-check the backup set 1345:
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