查看回滚段大小

select segment_name, tablespace_name, r.status,(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,max_extents, v.curext CurExtentFrom dba_rollback_segs r, v$rollstat vWhere r.segment_id = v.usn(+)order by segment_name 

今天在执行计算昨天的短信发送存储过程时候，报错：

snapshot too old:rollback segment 6 with name "_SYSSMU6$" too small”

在网上查了一下说是回滚段过小。

select segment_name, tablespace_name, r.status,

(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,

max_extents, v.curext CurExtent

From dba_rollback_segs r, v$rollstat v

Where r.segment_id = v.usn(+)

order by segment_name