undo表空间太大解决办法

1、检查原来undo表空间情况：select file_name,bytes/1024/1024 as MB from dba_data_files where tablespace_name like

1、检查原来undo表空间情况：

select file_name,bytes/1024/1024 as MB from dba_data_files where tablespace_name like 'UNDO%';

2、创建新的undo表空间：

create undo tablespace undotbs2 datafile '/u01/app/Oracle/oradata/orcl/undotbs02.dbf' size 2g autoextend on next 10m maxsize 10g;

3、切换到新的undo表空间：

alter system set undo_tablespace=undotbs2 scope=both;

4、检查原来undo表空间是否还在使用：

select usn,xacts,rssize/1024/1024/1024,hwmsize/1024/1024/1024,shrinks from v$rollstat order by rssize;

如果没有PENDING OFFLINE字样表示已经不再使用。

5、删除原来undo表空间：

drop tablespace undotbs1 including contents and datafiles;

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