mysql心跳相关的参数

。心跳信息由master在主机binlog日志文件在设定的间隔时间内没有收到新的事件时发出，以便slave知道master是否正常
slave_net_timeout 是设置在多久没收到数据后认为网络超时，之后 Slave 的 IO 线程会重新连接 Master
Slave_heartbeat_period

Shows the replication heartbeat interval (in seconds) on a replication slave.

Slave_last_heartbeat

Shows when the most recent heartbeat signal was received by a replication slave, as a TIMESTAMP value.

Slave_received_heartbeats

This counter increments with each replication heartbeat received by a replication slave since the last time that the slave was restarted or reset, or a CHANGE MASTER TO statement was issued.
参考：http://blog.csdn.net/u012377333/article/details/43563357

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