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MySQL 4个timeout参数解释

作者:daemonpei  来源:CSDN博客  发布日期:2011-04-07 20:14:15

4个timeout都是为了防止某一个链接长时间占用一数据库的描述符,又不干事情,或者网络有问题没有释放

这个描述符,线程阻塞种种资源浪费的情况.我们要主动的"卡"掉对端!

首先看看这4个timeout在mysql5.1手册里的英文解释:

connect_timeout
The number of seconds that the mysqld server waits for a connect packet before responding with Bad handshake.
interactive_timeout
The number of seconds the server waits for activity on an interactive connection before closing it.
wait_timeout
The number of seconds the server waits for activity on a noninteractive connection before closing it.
net_read_timeout
The number of seconds to wait for more data from a connection before aborting the read.
net_write_timeout
The number of seconds to wait for a block to be written to a connection before aborting the write.

从意思上可以理解为

connect_timeout在获取连接阶段(authenticate)起作用,

interactive_timeout和wait_timeout在连接空闲阶段(sleep)起作用,

net_read_timeout和net_write_timeout在连接繁忙阶段(query)起作用。

Tag标签: MySQL      4      timeout  
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