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本篇内容介绍了“standby database 有哪些日常维护”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让丸趣 TV 小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
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;
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