从trc查找死锁的问题
今天alert日志报ORA-00060的死锁错误，查看trc文件：
*** 2013-09-29 01:03:47.762
*** SERVICE NAME:(SYS$USERS) 2013-09-29 01:03:47.744
*** SESSION ID:(997.178) 2013-09-29 01:03:47.744
DEADLOCK DETECTED ( ORA-00060 )
[Transaction Deadlock]
The following deadlock is not an ORACLE error. It is a
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-005d002f-000046dd 113 997 X 182 786 X
TX-004d0026-00009b4e 182 786 X 113 997 X
session 997: DID 0001-0071-00000006 session 786: DID 0001-00B6-0000064E
session 786: DID 0001-00B6-0000064E session 997: DID 0001-0071-00000006
Rows waited on:
Session 786: obj - rowid = 0002D33A - AAAtM6AAdAAAJ9BABO
(dictionary objn - 185146, file - 29, block - 40769, slot - 78)
Session 997: obj - rowid = 000527D6 - AABSfWAAdAACmKAAAe
(dictionary objn - 337878, file - 29, block - 680576, slot - 30)
Information on the OTHER waiting sessions:
Session 786:
pid=182 serial=10783 audsid=64898626 user: 96/GALT
O/S info: user: batch, term: , ospid: 23674, machine: v490c1-app
program: sqlplus@v490c1-app (TNS V1-V3)
application name: SQL*Plus, hash value=3669949024
Current SQL Statement:
DELETE FROM ANA A WHERE EXISTS (SELECT 1 FROM (SELECT LOCATOR_ID FROM (SELECT T.LOCATOR_ID,ROWNUM RN FROM TEMP T ) WHERE RN > :B2 AND RN <= :B1 ) B WHERE A.LOCATOR_ID = B.LOCATOR_ID)
End of information on OTHER waiting sessions.
Current SQL statement for this session:
update ana_seg
set
SEGMENT_ID = :1,
SEAT_STATUS = :2,
SEGMENT_CLASS = :3,
SEGMENT_SHARE_CLASS = :4,
SEG_SEAT_NO = :5,
SEG_CREATION_NUM= :6,
SEG_CREATION_TIME = :7
where locator_id = :8
and SEG_ORDER_ID = :9
通过
select dbms_rowid.rowid_object('AAAtM6AAdAAAJ9BABO') from dual;
select dbms_rowid.rowid_object('AABSfWAAdAACmKAAAe') from dual;
查找出死锁资源的两个ROWID对应的object_id，然后执行
SELECT t.owner,t.object_name,t.object_type FROM all_objects t WHERE t.data_object_id = id;
查找对应的对象信息。一个对应的是ANA表，一个对应的是ANA_SEG表。
进而还可以通过：
SELECT * FROM ANA WHERE ROWID='AAAtM6AAdAAAJ9BABO';
查找表中该行记录的内容。
这里查到这两个表之间没有主外键关联，自然也不是因为外键没索引导致的死锁，且数据可能已被覆盖，因此查不到ROWID对应的记录了，尚未找到原因，怀疑是否可能是记录trc时出现紊乱的情况？但至少上面的方法可以进一步挖掘死锁的SQL资源以及对应的对象信息。
关于死锁，上面Oracle也说了：
The following deadlock is not an ORACLE error. It is a deadlock due to user error in the design of an application or from issuing incorrect ad-hoc SQL. The following information may aid in determining the deadlock:
一般是由应用产生的，所以检查应用可能是必要的，感觉分析的思路就是从trc中找到死锁的资源，再进一步分析关联的对象，挖掘产生的原因。
至于死锁的原因、外键索引以及trc的详细信息，找机会仔细研究下再总结。