锁表查询
SELECT object_name, machine, s.sid, s.serial# FROM gv$locked_object l, dba_objects o, gv$session s WHERE l.object_id = o.object_id AND l.session_id = s.sid;
释放锁
--alter system kill session ‘sid, serial#‘; ALTER system kill session ‘413, 3701‘;
原文：http://www.cnblogs.com/ycyang/p/6880865.html