1 查看被锁住的对象

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;

2 解锁

将1中查询出的sid和serial#，作为参数

alter system kill session '2400,21533';