Oracle自治事务引起的死锁
1.关于自治事务引起的死锁Oracle解释
Note:65961.
Because the parent and child transactions are independent, they also are not ableto share any locks; if a parent transaction has a resource locked that a childattemptsto obtain, then a deadlock situation occurs. In this case, the offendingstatement is automatically rolled back with an "ORA-00060: deadlock detected while waiting for resource" exception raised within the child. Information on how to troubleshoot a deadlock can be found in:
2.模拟自治事务引起的死锁
SQL> create table eymit(id int);
Table created
SQL> insert into eymit select 1 from dual;
1 row inserted
SQL> commit;
Commit complete
SQL> delete from eymit;
1 row deleted
SQL>
SQL> declare
2 pragma autonomous_transaction;
3 begin
4 delete from eymit;
5 commit;
6 end;
7 /
declare
pragma autonomous_transaction;
begin
delete from eymit;
commit;
end;
ORA-00060:等待资源时检测到死锁
ORA-06512:在line 5
3.分析日志
查看Alert文件信息
Mon Dec 24 18:26:04 2012
ORA-00060: Deadlock detected. More info in file /opt/local/oracle/diag/rdbms/gs3421/gs3421/trace/gs3421_ora_19373.trc
根据alert找到具体的trace文件，注意和普通死锁不一样，下面Blocker(s)和Waiter(s)为同一个sid，同时trace中有正在执行的SQL和被锁的对象ID
[oracle@CN01L0301000025 trace]$ more gs3421_ora_19373.trc
Trace file /opt/local/oracle/diag/rdbms/gs3421/gs3421/trace/gs3421_ora_19373.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /opt/local/oracle/product/11.2.0/dbhome_1
System name: Linux
Node name: CN01L0301000025
Release: 2.6.18-164.el5
Version: #1 SMP Thu Sep 3 03:28:30 EDT 2009
Machine: x86_64
Instance name: gs3421
Redo thread mounted by this instance: 1
Oracle process number: 46
Unix process pid: 19373, image: oracle@CN01L0301000025
*** 2012-12-24 18:26:04.290
*** SESSION ID:(1152.197) 2012-12-24 18:26:04.290
*** CLIENT ID:() 2012-12-24 18:26:04.290
*** SERVICE NAME:(gs3421) 2012-12-24 18:26:04.290
*** MODULE NAME:(PL/SQL Developer) 2012-12-24 18:26:04.290
*** ACTION NAME:(Command Window - New) 2012-12-24 18:26:04.290
*** 2012-12-24 18:26:04.290
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-0003001b-0001dd36 46 1152 X 46 1152 X
session 1152: DID 0001-002E-0000CA27 session 1152: DID 0001-002E-0000CA27
Rows waited on:
Session 1152: obj - rowid = 000700C5 - AABwDFAAEAAAv5cAAA
(dictionary objn - 458949, file - 4, block - 196188, slot - 0)
----- Information for the OTHER waiting sessions -----
----- End of information for the OTHER waiting sessions -----
Information for THIS session:
----- Current SQL Statement for this session (sql_id=g3mk1njgws241) -----
DELETE FROM EYMIT
----- PL/SQL Stack -----
----- PL/SQL Call Stack -----
object line object
handle number name
0x15960f918 5 anonymous block
===================================================
PROCESS STATE
4.解决方案
自治事务和主事务是两个独立的事力，根据上面信息找到相关的自治事务提前进行提交。