What is the difference between obsolete and expired status?
Oracle expert Brian Peasland explains the difference between obsolete status and expired status.
A status of "obsolete" means the backup piece is still available, but it is no longer needed. The backup piece...
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is no longer needed since RMAN has been configured to no longer need this piece after so many days have elapsed, or so many backups have been performed. RMAN's retention configuration determines when a backup piece becomes obsolete.