Practical measurements result shows that secondary time server are better than primary ones from the perspectives of network delay.
实际测量结果表明，在网络延迟方面，二级时间服务器要优于一级时间服务器。
Now query the stores_demo database and look for customer table at RS secondary server after 5 minutes of commit time.
现在查询stores_demo数据库，并在提交时间过去5分钟后在RS次要服务器上查找customer表。
Lag time: the time the secondary server requires to confirm communication from the primary server.
Lagtime：备份服务器确认来自主服务器的通信所需的时间。
If the primary server is unavailable, but the client still has network connectivity, you want to fail over to a secondary server as opposed to using system time.
如果主服务器不可用，但客户机尚具有网络连接，就需要故障转换到备用服务器，而不是使用系统时间。
In the disconnected method, you set the network state flag for the time client informing it to switch to the secondary server.
在disconnected方法中，可以为timeclient设置网络状态标志以通知它转换到备用服务器。
In the disconnected method, you set the network state flag for the time client informing it to switch to the secondary server.
在disconnected方法中，可以为timeclient设置网络状态标志以通知它转换到备用服务器。
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