Oracle 查看对象持有锁的情况

时间：2016-08-06 14:25:54 阅读：233 评论：0 收藏：0 [点我收藏+]

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同事在测试库上对一个表加字段，提示 ORA-00054，资源忙。应该是表对象的锁没有释放。

有关Oracle 锁的说明，参考：

用如下SQL 查看一下系统中相关对象上锁的情况：

[sql] view plain copy

<pre name="code" class="sql">/* Formatted on 2012/2/13 14:24:32 (QP5 v5.185.11230.41888) */
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 = ‘xxxx‘;</pre><br>

技术分享

该SQL 显示所有对象上的锁，如果要查某个具体的对象，可以根据OBJECT_NAME 字段进行一下过滤，找到对应的SID 之后去查V$SESSION 视图。

该视图会显示session 对应的信息，包括终端的信息，如果找到了终端，可以让它提交或者回滚一下就OK了。我这里是测试环境，直接把session kill 掉了。然后修改表就ok了。

[sql] view plain copy

后来测试了发现，上面的脚本有时候会查不到对象的的相关记录，故增加了V$ACCESS视图，通过对这个视图进行对象的判断，修改之后的脚本如下：

[sql] view plain copy

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,V$ACCESS A
WHERE L.SID = S.SID AND L.ID1 = O.OBJECT_ID AND S.SID=A.SID AND A.OBJECT= ‘PROC_VALIDATE_RULE_V3‘;