释放undo表空间

1 查看undo表空间使用情况

 select tablespace_name,bytes/1024/1024 from dba_data_files where tablespace_name='UNDOTBS1.DBF';

2 创建新的undo表空间

 create undo tablespace xxx;

3 更改参数文件
 alter system set undo_tablespace='UNDOTBS2' scope=spfile;

4 查看undo状态

 select usn,xacts,status,rssize/1024/1024,hwmsize/1024/1024,shrinks from v$rollstat order by rssize;
PS:当status的状态为offline的时候切换删除undotbs1!参数undo_retention是指过了xxx后undo里面数据失效

5 删除undotbs1
 drop tablespace undotbs1 including contents;

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/16546776/viewspace-687435/，如需转载，请注明出处，否则将追究法律责任。

转载于:http://blog.itpub.net/16546776/viewspace-687435/