oracle中死锁的处理

SELECT /*+ rule */ s.username,decode(l.type, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', l.type) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
FROM v$session s, v$lock l, dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT NULL