查找被锁定的表，用户，session：
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，杀死session：
alter system kill session ‘sid, serial#‘;
for update被锁定解锁
原文：http://www.cnblogs.com/prisoner079/p/5851124.html
