1.停止Standby

select process, status from v$managed_standby; --檢視備庫是否在應用日誌進行恢復

alter database recover managed standby database cancel;
shutdown immediate;

2.切換到只讀模式

-----由shutdown模式切換到只讀模式-------

startup nomount;
alter database mount standby database;
alter database open read only;

-----由應用日誌模式切換到只讀模式-------

alter database recover managed standby database cancel; -- 取消日誌應用
alter database open read only;

3.切換回管理恢復模式

startup nomount;
alter database mount standby database;
alter database recover managed standby database disconnect from session; -- 啟動日誌應用

alter database recover managed standby database using current logfile disconnect from session;

4.主庫和備庫之間角色切換

4.1 主庫切換為備庫
alter database commit to switchover to physical standby;

alter database commit to switchover to physical standby with session shutdown;-- 主庫有會話連線的時候
shutdown immediate
startup nomount;
alter database mount standby database;
alter database recover managed standby database disconnect from session;

4.2 從庫切換為主庫

alter database commit to switchover to primary;
shutdown immediate;
startup;
alter system switch logfile;

5.備庫自動使用主庫傳過來的日誌進行恢復

alter database recover automatic standby database;

6.更改保護模式

alter database set standby database to maximize protection;
alter database set standby database to maximize availability;
alter database set standby database to maximize performancen;

7.取消自動恢復模式

alter database recover managed standby database cancel;
alter database recover managed standby database finish;
alter database recover managed standby database finish force;

DataGuard 日常維護命令整理

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