摘自：Backup and Recovery Advanced User's Guide
The term obsolete does not mean the same as expired.
A backup is obsolete when REPORT OBSOLETE or DELETE OBSOLETE
determines, based on the user-defined retention policy, that it is not
needed for recovery.
A backup is considered expired only when RMAN
performs a crosscheck and cannot find the file.
In short, obsolete means "not needed," whereas expired means "not found."
原来一直没分清，最后一句话把这个解释得很精炼。。。
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