Home Database Mysql Tutorial SYSAUX表空间使用率高问题处理

SYSAUX表空间使用率高问题处理

Jun 07, 2016 pm 05:41 PM

一般来讲除开业务数据存放的表空间,DBA要着重关注SYSTEM,SYSAUX,UNDO,TEMP表空间,SYSTEM表空间的大小一般是衡定的,UNDO和TEMP表空间的大小由数据库的业务情况

一般来讲除开业务数据存放的表空间,DBA要着重关注SYSTEM,SYSAUX,UNDO,TEMP表空间,SYSTEM表空间的大小一般是衡定的,UNDO和TEMP表空间的大小由数据库的业务情况决定,而SYSAUX表空间在默认条件下你如果不做任何配置,随着时间的推移,会膨胀的越来越大!SYSAUX表空间做为SYSTEM表空间的辅助表空间,主要存放EM相关的内容以及表统计信息,AWR快照,审计信息等,个人认为,服务器空间,如果你的SYSAUX表空间大小超过2G,那么该考虑让他减肥了! 

一:使用下列语句查询表空间使用率 

二:查询SYSAUX表空间内各个分类项目占存储空间的比重,香港虚拟主机,很明显可以看出来AWR快照占用了2G左右的空间,统计信息为149M左右,同时数据库关闭了审计audit_trail,香港虚拟主机,所以审计表aud$不占空间 

三:修改统计信息的保持时间,默认为31天,这里修改为7天,过期的统计信息会自动被删除

四:修改AWR快照的保存时间为7天(7*24*60),每小时收集一次,也可以通过EM界面查看和修改

五:删除AWR快照,再次查看SYSAUX表空间使用率,最后表空间使用率降低为38.42%

参考文章,感谢作者分享!

本文出自 “斩月” 博客,谢绝转载!

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