查询锁表信息 ：

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';