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oracle 11g dg broker 开启fast-start failover自动故障切换

发表于：2025-12-01 作者：千家信息网编辑

千家信息网最后更新 2025年12月01日，一.首先保证主从数据库的闪回数据库功能以及强制归档都打开，如下保证都为yes SQL> select flashback_on,force_logging from v$database; FLASH

千家信息网最后更新 2025年12月01日oracle 11g dg broker 开启fast-start failover自动故障切换一.首先保证主从数据库的闪回数据库功能以及强制归档都打开，如下保证都为yes SQL> select flashback_on,force_logging from v$database; FLASHBACK_ON FOR ------------------ --- NO NO 1.1开启闪回数据库 SQL> ALTER SYSTEM SET db_recovery_file_dest_size=3g SCOPE=BOTH; System altered. SQL> alter system set db_recovery_file_dest='/data/u01/app/oracle/fast_recovery_area'; System altered. SQL> alter database flashback on; Database altered. 1.2开启强制归档 SQL> alter database force logging; Database altered. SQL> select flashback_on,force_logging from v$database; FLASHBACK_ON FOR ------------------ --- YES YES
二：开启fast-start failover 2.1：开启 fast-start failover [oracle@beijing-fuli-hadoop-02 ~]$ dgmgrl sys/ oracle@db2 DGMGRL for Linux: Version 11.2.0.4.0 - 64bit Production Copyright (c) 2000, 2009, Oracle. All rights reserved. Welcome to DGMGRL, type "help" for information. Connected. DGMGRL> enable fast_start failover; Enabled. 2.2.查看配置状态，发现警告，因为没有启动observer而告警！ DGMGRL> show configuration Configuration - dbha_c Protection Mode: MaxPerformance Databases: db2 - Primary database Warning: ORA-16819: fast-start failover observer not started db1 - (*) Physical standby database Warning: ORA-16819: fast-start failover observer not started Fast-Start Failover: ENABLED Configuration Status: WARNING 2.3开启启动观察器（observer）： DGMGRL> show configuration Configuration - dbha_c Protection Mode: MaxPerformance Databases: db2 - Primary database db1 - (*) Physical standby database Fast-Start Failover: ENABLED Configuration Status: SUCCESS 由于observer的启动会一直占用session 窗口的，所以建议写成脚本挂后台这里我们在备库上创建脚本，具体如下创建一个名叫observer.sql的脚本，把下面的命令放进去，然后执行该脚本即可。 nohup dgmgrl sys/oracle@db2 "start observer">>observer.log 2>&1 & 三：验证自动切换： db2主库： SQL> select DATABASE_ROLE,OPEN_MODE from v$database;
DATABASE_ROLE OPEN_MODE ---------------- -------------------- PRIMARY READ WRITE db1为standby SQL> select DATABASE_ROLE,OPEN_MODE from v$database; DATABASE_ROLE OPEN_MODE ---------------- -------------------- PHYSICAL STANDBY READ ONLY WITH APPLY db2主库模拟异常关闭 SQL> shu abort ORACLE instance shut down. 再次查看db1的状态： SQL> select DATABASE_ROLE,OPEN_MODE from v$database; DATABASE_ROLE OPEN_MODE ---------------- -------------------- PRIMARY READ WRITE

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