oracle 表的死锁以及解决之道

bzcvjmgwse

　　1.查询锁定的对象
　　

SELECT S.SID SESSION_ID,
S.USERNAME,
DECODE (LMODE,
0, ' None ',
1, ' Null ',
2, ' Row-S(SS) ',
3, ' Row-X(SX) ',
4, ' Share',
5, 'S/Row-X (SSX) ',
6, 'Exclusive ',
TO_CHAR (LMODE))
MODE_HELD,
DECODE (REQUEST,
0, ' None ',
1, ' Null ',
2, ' Row-S(SS) ',
3, ' Row-X(SX) ',
4, ' Share',
5, 'S/Row-X (SSX) ',
6, 'Exclusive ',
TO_CHAR (REQUEST))
MODE_REQUESTED,
O.OWNER || ' . ' || O.OBJECT_NAME || '  ( ' || O.OBJECT_TYPE || ' ) '
AS OBJECT_NAME,
S.TYPE LOCK_TYPE,
L.ID1 LOCK_ID1,
L.ID2 LOCK_ID2
FROM V$LOCK L, SYS.DBA_OBJECTS O, V$SESSION S
WHERE L.SID = S.SID AND L.ID1 = O.OBJECT_ID AND object_name = 'DAT_USERS';
 　　DAT_USERS  -> 此处为对象名，可以是表，也可以是索引。
　　
　　2.查询出来之后，进行释放操作：
　　

alter system kill session 'sid, serial#'
　　
　　此处的sid, serial:
　　

SELECT SID,SERIAL#
FROM V$SESSION
WHERE SID IN (SELECT S.SID SESSION_ID
FROM V$LOCK L, SYS.DBA_OBJECTS O, V$SESSION S
WHERE L.SID = S.SID AND L.ID1 = O.OBJECT_ID AND object_name = 'DAT_USERS'
);