undo系列学习之Oracle DBA常用的脚本
DBA在维护Oracle的过程，和undo有关的常用脚本。在前面的一些文章也涉及了挺多的，在此简单总结一点。怎样查询数据库当前某个ses
DBA在维护Oracle的过程，和undo有关的常用脚本。在前面的一些文章也涉及了挺多的，，在此简单总结一点。
1）怎样查询数据库当前某个session的事务所使用的回滚段大小？
2）查询哪个用户正在使用回滚段的资源？
3）显示undo表空间统计信息--v$undostat，自动管理引入的，每隔10分钟汇报一次
4）显示在线undo段的统计信息
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