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可用性组Failover切换后，数据库变成read-only的处理

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Jun 07, 2016 pm 03:48 PM

failoverswitchbecomedatabase

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

可用性组Failover切换后，数据库变成read-only的处理

通过Cluster IP访问的数据库变成了read-only：

可用性组Failover切换后，数据库变成read-only的处理

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：

可用性组Failover切换后，数据库变成read-only的处理

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