--锁表查询SQL

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SESSION SQL: 
--alter system kill session ‘sid, serial#‘; 
ALTER system kill session ‘23, 1647‘;