没能辩识指定的主机名，网络失败。
未能对检测信号消息做出响应是由几个事件导致的，例如计算机失败、网络接口失败、网络失败，甚至是很少见的高活动期间。
Failure to respond to a heartbeat message is caused by several events, such as computer failure, network interface failure, network failure, or even periods of unusually high activity.
如果后端数据库失败，或者您的网络连接失败或较慢，您的应用程序可以继续运行，这种失败对于应用程序是透明的，不会产生任何影响。
If the back-end database fails, or if your network connection to it fails or slows, your application keeps running, and this failure is transparent to and does not affect your application.
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