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分类: Oracle

2011-07-11 13:26:28

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A backup is obsolete when REPORT OBSOLETE or DELETE OBSOLETE determines, based on the user-defined retention policy, that it is not needed for recovery.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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