ORA-02019的处理(转载于kasaur的个人空间http://space.itpub.net/25618347)

今天早上过来，查看测试库的告警日志发现，一直不断的报错:ORA-02019，具体如下：

alert输出如下：

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 10:18:46 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 10:19:34 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 10:20:47 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 10:22:35 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 10:25:17 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

对应的trace文件内容如下：

[oracle@testdb ~]$ more /oracle/admin/UAT/bdump/uat_reco_16233.trc

/oracle/admin/UAT/bdump/uat_reco_16233.trc

Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /oracle/product/10.2.0/db_1

System name: Linux

Node name: testdb

Release: 2.6.18-128.el5

Version: #1 SMP Wed Dec 17 11:41:38 EST 2008

Machine: x86_64

Instance name: UAT

Redo thread mounted by this instance: 1

Oracle process number: 5

Unix process pid: 16233, image:oracle@testdb(RECO)

*** SERVICE NAME:(SYS$BACKGROUND) 2012-02-13 10:18:13.429

*** SESSION ID:(1096.3) 2012-02-13 10:18:13.429

*** 2012-02-13 10:18:13.429

ERROR, tran=7.27.49932, session#=1, se=0:

ORA-02019: connection description for remote database not found

*** 2012-02-13 10:18:46.453

初步判断以为是db-link问题，到数据库里查询，并没有这个db-link，仔细观察trace文件可以发现，这是个oracle的后台进程（RECOVER进程），会话ID是1096，进一步观察不难发现，应该是oracle的RECOVER进程要恢复一个transaction，其事务号：7.27.49932，而需要被恢复的数据库连接名不正确，只要数据库开启状态，该进程就会一直尝试进行恢复，所以alert中会不断的出现该错误，最后查询metalink，有如下解释：

When a failure occurs during commit processing, automatic recovery will

consistently resolve the results at all sites involved in the

transaction. However, if the remote database is destroyed or

recreated before recovery completes, then the entries used to

control recovery in DBA_2PC_PENDING and associated tables will never

be removed, and recovery will periodically retry. Procedure

purge_lost_db_entry allows removal of such transactions from the local site.

查询对应视图发现：

SELECT LOCAL_TRAN_ID,global_tran_id,STATE, MIXED,to_char(FAIL_TIME,'yyyy-mm-dd hh24:mi:ss')FAIL_TIME,

to_char(RETRY_TIME,'yyyy-mm-dd hh24:mi:ss')Retry_Time

FROM DBA_2PC_PENDING;

7.27.49932 UAT.bb70863a.7.27.49932 collecting no 2011-09-29 18:23:40 2012-02-13 10:58:13

有问题的db-link 就是上面红色部分，该事务第1次失败时间是：2011-09-29 18:23:40

最近的尝试时间是：2012-02-13 10:58:13

此问题不影响测试数据库的正常运行，可以忽略。

如需要解决，不再报错，可以强制移掉此事务来解决。方法如下：

execute sys.dbms_transaction.purge_lost_db_entry('<local_tran_id>');

执行完上面的语句后再观察alert，这个错误终于消失了。

[oracle@testdb ~]$ tail -f /oracle/admin/UAT/bdump/alert_UAT.log

ORA-02019: connection description for remote database not found

Mon Feb 13 10:47:29 CST 2012

Thread 1 advanced to log sequence 9006 (LGWR switch)

Current log# 3 seq# 9006 mem# 0: /oracle/oradata/UAT/redo03.log

Mon Feb 13 10:47:37 CST 2012

Thread 1 advanced to log sequence 9007 (LGWR switch)

Current log# 1 seq# 9007 mem# 0: /oracle/oradata/UAT/redo01.log

Mon Feb 13 10:58:13 CST 2012

Errors in file /oracle/admin/UAT/bdump/uat_reco_16233.trc:

ORA-02019: connection description for remote database not found

Mon Feb 13 11:08:30 CST 2012

ALTER SYSTEM ARCHIVE LOG

Mon Feb 13 11:08:30 CST 2012

Thread 1 advanced to log sequence 9008 (LGWR switch)

Current log# 5 seq# 9008 mem# 0: /oracle/oradata/UAT/redo05.log

Mon Feb 13 11:09:14 CST 2012

Thread 1 advanced to log sequence 9009 (LGWR switch)

Current log# 6 seq# 9009 mem# 0: /oracle/oradata/UAT/redo06.log