可用性组Failover切换后，数据库变成read-only的处理
可用性组中实例A（Primary）和B（Secondary）组成Automatic Failover，同时Cluster的Core Resources在实例A上。如果对可用性组进行Failover切换，则通过Cluster IP访问的数据库就变成read-only。如下图所示： 手动Failover 通过Cluster IP访问的数据库变成了
可用性组中实例A（Primary）和B（Secondary）组成Automatic Failover，同时Cluster的Core Resources在实例A上。如果对可用性组进行Failover切换，则通过Cluster IP访问的数据库就变成read-only。如下图所示：
手动Failover
通过Cluster IP访问的数据库变成了read-only：
这时，如果不Failover再切换回来，如何能使通过Cluster IP访问的数据库变成可读写的呢？ 将Cluster转移到其他节点（实例B）可以实现：
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