oracle物理DG管理-手工主备切换

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主备切换，包括2种switchover与 failover 

具体环境http://blog.csdn.net/sunziyue/article/details/50799648基础之上操作

1switchover操作

1.1在DG主库上(orcl)执行:

select switchover_status from v$database;

SQL> select switchover_status from v$database;

SWITCHOVER_STATUS
--------------------
TO STANDBY

alter database commit to switchover to physical standby;

或者

SQL> select switchover_status from v$database;

SWITCHOVER_STATUS
--------------------
SESSIONS ACTIVE

alter database commit to switchover to physical standby with session shutdown;

然后重启至mount

startup  nomount

alter database mount standby database;

1.2在DG备库(orcldg)上执行:

select sequence#, applied from v$archived_log where applied='YES'order by sequence#;//查日志应用

select switchover_status from v$database;//确认状态

alter database commit to switchover to primary;

shutdown  immediate

startup

物理DG切换完成。

2failover切换物理DG

2.1检查归档文件是否连续

 SQL>SELECT THREAD#, LOW_SEQUENCE#, HIGH_SEQUENCE# FROM V$ARCHIVE_GAP; //如果有记录，复制对应的归档到待转换的standby 服务器。

//注册

SQL>ALTER DATABASE REGISTER PHYSICAL LOGFILE    'filename';

//关闭apply和结束应用动作

SQL>alter database recover managed standby database finish force;//force关键字将会停止当前活动的RFS 进程，以便立刻执行failover。

//切换

SQL>alter database commit to switchover to primary;

或者

SQL>alter database commit to switchover to primary   with session shutdown;

//直接打开

SQL>alter database open;

完成。

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