oracle dataguard日常维护命令总结
1.停止Standbyselect process, status from v$managed_standby; --查看备库是否在应用日志进行恢复
alter database recover managed standby database cancel;
shutdown immediate;
2.切换到只读模式
-----由shutdown模式切换到只读模式-------
startup nomount;
>
> -----由应用日志模式切换到只读模式-------
alter database recover managed standby database cancel; -- 取消日志应用
alter database open read only;
3.切换回管理恢复模式
startup nomount;
> alter database recover managed standby database disconnect from session; -- 启动日志应用
alter database recover managed standby database using current logfile disconnect from session;
4.主库和备库之间角色切换
4.1 主库切换为备库
alter database commit to switchover to physical standby;
alter database commit to switchover to physical standby with session shutdown;-- 主库有会话连接的时候
shutdown immediate
startup nomount;
>
> 4.2 从库切换为主库
alter database commit to switchover to primary;
shutdown immediate;
startup;
> 5.备库自动使用主库传过来的日志进行恢复
alter database recover automatic standby database;
6.更改保护模式
alter database set standby database to maximize protection;
>
> 7.取消自动恢复模式
alter database recover managed standby database cancel;
>
>
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