RMAN 中delete exipired 和 delete obsolete 的区别

最新推荐文章于 2023-07-24 10:07:35 发布

转载最新推荐文章于 2023-07-24 10:07:35 发布 · 328 阅读

本文介绍了如何使用RMAN命令delete expired及delete obsolete进行数据库备份管理。delete expired用于清理RMAN认为存在但实际上已被删除的备份记录，而delete obsolete则依据备份保留策略删除不再需要的备份，并从RMAN资料库和控制文件中更新相关信息。

delete expired

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.

delete expired删除的是那些本来RMAN以为存在但是实际上在磁盘或者磁带上已经被删除了的信息，删除的只是RMAN资料库中的记录；delete obsolete则删除旧于备份保留策略定义的备份数据同时也更新RMAN资料库以及控制文件。

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EG:

#delete obsolete and expired backup and archivelog
run {
delete noprompt obsolete;
crosscheck archivelog all;
delete noprompt expired archivelog all;
crosscheck backup;
delete noprompt expired backup;
}

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