ORACLE数据库如何查看死锁

SELECT substr(v$lock.sid,1,4) "SID",
substr(username,1,12) "UserName",
substr(object_name,1,25) "ObjectName",
v$lock.type "LockType",
decode(rtrim(substr(lmode,1,4)),
'2','Row-S (SS)','3','Row-X (SX)',
'4','Share', '5','S/Row-X (SSX)',
'6','Exclusive', 'Other' ) "LockMode",
substr(v$session.program,1,25) "ProgramName"
FROM V$LOCK,SYS.DBA_OBJECTS,V$SESSION
WHERE (OBJECT_ID = v$lock.id1
AND v$lock.sid = v$session.sid
AND username IS NOT NULL
AND username NOT IN ('SYS','SYSTEM')
AND SERIAL# != 1);

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