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物理Data Guard主备库切换步骤

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Release: 2016-06-07 17:31:54
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物理Data Guard角色转换步骤 Step 1 验证主库是否能执行角色转换到备库(原主库执行) SQLgt; SELECT SWITCHOVER_STATUS FR

物理Data Guard角色转换步骤

 

Step 1 验证主库是否能执行角色转换到备库(原主库执行)

 

SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE; SWITCHOVER_STATUS ----------------- TO STANDBY 1 row selected

 

Step 2 开始把物理主库改变为物理备库(原主库执行)

 

SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY; SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY with session shutdown;

 

注:如果有活动的session可以使用此选项,否则转换会遇到ORA-01093错误,,也可以杀掉活动会话或等活动会话后进行转换

 

 

Step 3 关闭并重启主库(原主库执行)

SQL> SHUTDOWN IMMEDIATE; SQL> STARTUP MOUNT;

 

Step 4 验证备库是否能执行角色转换到主库(原备库执行)

 

SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE; SWITCHOVER_STATUS ----------------- TO_PRIMARY 1 row selected

 

Step 5 开始把物理备库转换成物理主库(原备库执行)

 

SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;

 

--如果报ORA-16139: media recovery required,可能是由于未应用日志引起,可先执行

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

 

Step 6 打开备库,然后关闭重启.(原备库执行)

 

SQL> ALTER DATABASE OPEN;

SQL> SHUTDOWN IMMEDIATE;

SQL> STARTUP;

 

Step 7 验证是否转换成功(原备库执行)

 

SQL> ALTER SYSTEM SWITCH LOGFILE;

 

Setp 8 应用归档日志(原主库上执行)

 

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

 

相关参考:

Oracle Data Guard 重要配置参数 

基于同一主机配置 Oracle 11g Data Guard 

探索Oracle之11g DataGuard

Oracle Data Guard (RAC+DG) 归档删除策略及脚本

Oracle Data Guard 的角色转换

Oracle Data Guard的日志FAL gap问题

Oracle 11g Data Guard Error 16143 Heartbeat failed to connect to standby 处理方法

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