物理standby database的日常维护

1.停止Standby select 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; alter database mount standby database; alter database open read only; -----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 mount standby database; 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; alter database mount standby database; alter database recover managed standby database disconnect from session;   4.2 从库切换为主库 alter database commit to switchover to primary; shutdown immediate; startup alter system switch logfile;   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; alter database set standby database to maximize availability; alter database set standby database to maximize performancen;   7.取消自动恢复模式 alter database recover managed standby database cancel; alter database recover managed standby database finish; alter database recover managed standby database finish force;