Experience: is what you get soon after you need it.
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Sunday, April 18, 2010
RMAN EXPIRED VS OBSOLETE
If you run CROSSCHECK, and if RMAN cannot locate the files, then it updates their
records in the RMAN repository to EXPIRED status. You can then use the DELETE
EXPIRED command to remove records of expired backups and copies from the RMAN
backups that are no longer needed to satisfy specified recoverability requirements. You can delete files obsolete according to the configured default retention policy, or another retention policy that you specify