RMAN delete expired & delete obsolete

最新推荐文章于 2025-02-05 13:48:44 发布

最新推荐文章于 2025-02-05 13:48:44 发布 · 88 阅读

本文详细解析了RMAN中delete expired与delete obsolete两个命令的区别。前者用于移除那些已无法找到的备份记录，后者则用来清理不再符合恢复需求的文件。文章通过简洁的语言帮助读者理解如何高效地管理数据库备份。

先看官方文档解释：

delete exipired

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 repository

delete obsolete

The RMAN DELETE command supports an OBSOLETE option, which deletes 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 as an option to the DELETE OBSOLETE command. As with other forms of the DELETE command, the files deleted are removed from backup media, deleted from the recovery catalog, and marked as DELETED in the control file

简言之、就是“在不在”和“要不要”的区别

expired 是不在了、obsolete 是不要了

不在并不一定是不需要的
不需要的也并不一定不在

数据库管理的时候、痛苦的是不需要的还在、比这更痛苦的是、需要的已经不在了