About Backup Management
An essential part of a backup and recovery strategy is managing backups after you
create them. Backup management includes deleting obsolete backups and performing
periodic checks to ensure that backups are available and usable.
A backup recorded in the RMAN repository has one of the following status values:
■ Available, meaning that the backup is still present on disk or tape, as recorded in
the repository
■ Expired, meaning that the backup no longer exists on disk or tape, but is still listed
in the repository
■ Unavailable, meaning that the backup is temporarily not available for data
recovery operations (because, for example, it is stored on a tape that is stored
offsite or on a disk that is currently not mounted)
Managing Backups
9-28 Oracle Database 2 Day DBA
Backups can also be obsolete. An obsolete backup is, based on the currently configured
retention policy, no longer needed to satisfy data recovery goals.
Maintenance tasks that you can perform in RMAN include the following:
■ Viewing details about your backups
■ Cross-checking your repository, which means checking whether backups listed in
the repository exist and are accessible, and marking as expired any backups not
accessible at the time of the cross-check
■ Deleting the record of expired backups from your RMAN repository
■ Deleting obsolete backups from the repository and from the backup media
■ Validating backups to ensure that a given backup is available and not corrupted
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