1、查看哪个表被锁
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id
2、查看引起表锁住的Session
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time
3、清除锁住表的Session
alter system kill session ‘sid,serial#‘;
原文：http://www.cnblogs.com/shangrongyiweng/p/4795482.html