1.查看锁表

select sess.sid, 
    sess.serial#, 
    lo.oracle_username, 
    lo.os_user_name, 
    ao.object_name, 
    lo.locked_mode 
    from v$locked_object lo, 
    dba_objects ao, 
    v$session sess 
where ao.object_id = lo.object_id and lo.session_id = sess.sid; 

2.杀掉锁表

　　根据查到的sql上面的 sess.sid,   sess.serial#来更改锁表

alter system kill session '2562,34771'