解锁语句：
alter system kill session 'sid, serial#';
alter system kill session '23, 1647';
查询那些对象被锁：
select object_name,machine,s.sid,s.serial# from v$locked_object l,dba_objects o ,v$session s where l.object_id = o.object_id and l.session_id=s.sid;
杀死一个进程：
alter system kill session '24,111'; -- (其中24,111分别是上面查询出的sid,serial#)