如何启动DataGuard的备用数据库

文章作者 100test 发表时间 2007:03:14 14:00:35
来源 100Test.Com百考试题网

一大早来到公司，打开邮箱，发现收到了一堆的报警邮件，一个Standby数据库Down掉了。

登陆检查主库，警告日志记录了错误信息:

*** 2006-10-30 07:32:10.614 kcrrfail: dest:2 err:12560 force:0 ORA-12560: TNS:protocol adapter error *** 2006-10-30 07:34:10.615 Error 12541 connecting to destination LOG_ARCHIVE_DEST_2 standby host bmarksb Error 12541 attaching to destination LOG_ARCHIVE_DEST_2 standby host bmarksb Heartbeat failed to connect to standby bmarksb. Error is 12541. *** 2006-10-30 07:34:10.615 kcrrfail: dest:2 err:12541 force:0 ORA-12541: TNS:no listener *** 2006-10-30 07:36:10.615 Error 12541 connecting to destination LOG_ARCHIVE_DEST_2 standby host bmarksb Error 12541 attaching to destination LOG_ARCHIVE_DEST_2 standby host bmarksb Heartbeat failed to connect to standby bmarksb. Error is 12541.

马上登陆从库主机，手工启动备用数据库：

[oracle@wapcom2 bdump]$ sqlplus "/ as sysdba" SQL*Plus: Release 9.2.0.6.0 - Production on Mon Oct 30 08:17:24 2006 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Connected to an idle instance. SQL> startup nomount. ORACLE instance started. Total System Global Area 470881780 bytes Fixed Size 452084 bytes Variable Size 167772160 bytes Database Buffers 301989888 bytes Redo Buffers 667648 bytes SQL> alter database mount standby database. Database altered. SQL> alter database recover managed standby database disconnect from session. Database altered. SQL> exit Disconnected from Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.6.0 - Production [oracle@wapcom2 bdump]$ lsnrctl start

观察从库的日志信息，发现归档可以自动应用:

[oracle@wapcom2 bdump]$ tail -f alert_bmark.log Standby Database mounted. Completed: alter database mount standby database Mon Oct 30 08:19:23 2006 alter database recover managed standby database disconnect from session Attempt to start background Managed Standby Recovery process MRP0 started with pid=12 MRP0: Background Managed Standby Recovery process started Media Recovery Waiting for thread 1 seq# 5151 Mon Oct 30 08:19:29 2006 Completed: alter database recover managed standby database di Mon Oct 30 08:22:58 2006 Media Recovery Log /opt/oracle/oradata/bmark/stdarch/1_5151.arc Media Recovery Log /opt/oracle/oradata/bmark/stdarch/1_5152.arc Media Recovery Log /opt/oracle/oradata/bmark/stdarch/1_5153.arc Media Recovery Log /opt/oracle/oradata/bmark/stdarch/1_5154.arc Media Recovery Log /opt/oracle/oradata/bmark/stdarch/1_5155.arc Media Recovery Waiting for thread 1 seq# 5156

再检查原因，发现原来是主机出现问题，在夜间不断重起：

-bash-2.05b$ last |grep reboot reboot system boot 2.4.21-15.ELsmp Mon Oct 30 08:10 (02:14) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 07:51 (02:32) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 07:38 (02:45) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 07:35 (02:48) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 07:21 (03:02) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 07:18 (03:05) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 06:39 (03:44) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 06:37 (03:46) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 06:32 (03:51) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 06:03 (04:21) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 01:48 (08:36) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 01:23 (09:01) reboot system boot 2.4.21-15.ELsmp Mon Oct 30 00:39 (09:44)

初步看来是硬件出现了故障，最近的硬件故障极为频繁，年底也到了事故多发期。

提醒大家也多多注意。