如题，我有两个数据库 主库 A 192.168.30.128 备库 B 192.168.28.129 现在的情况是我把两台数据库用主从复制模式，主库开启binlog，备库通过主库binlog重演主库，生产主库备份。主库master 备库slave ，备库作为了只读数据库，现在主库挂了，有何办法能使主库失效，应用直接启动备库
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