SYSAUX表空间使用率高问题处理
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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