MySQL中interactive_timeout和wait_timeout的区别

缺乏、安全感 2021-12-21 11:07 240阅读 0赞

转载自:https://www.cnblogs.com/kccdzz/p/6070198.html

在用mysql客户端对数据库进行操作时,打开终端窗口,如果一段时间没有操作,再次操作时,常常会报如下错误:

  1. ERROR 2013 (HY000): Lost connection to MySQL server during query
  2. ERROR 2006 (HY000): MySQL server has gone away
  3. No connection. Trying to reconnect...

这个报错信息就意味着当前的连接已经断开,需要重新建立连接。

那么,连接的时长是如何确认的?

其实,这个与interactive_timeout和wait_timeout的设置有关。

首先,看看官方文档对于这两个参数的定义

interactive_timeout

默认是28800,单位秒,即8个小时

  1. The number of seconds the server waits for activity on an interactive connection before closing it. An interactive client is defined as a client that uses the CLIENT_INTERACTIVE option to mysql_real_connect(). See also wait_timeout.

wait_timeout

默认同样是28800s

  1. The number of seconds the server waits for activity on a noninteractive connection before closing it.
  2. On thread startup, the session wait_timeout value is initialized from the global wait_timeout value or from the global interactive_timeout value, depending on the type of client (as defined by the CLIENT_INTERACTIVE connect option to mysql_real_connect()). See also interactive_timeout.

根据上述定义,两者的区别显而易见

1> interactive_timeout针对交互式连接,wait_timeout针对非交互式连接。所谓的交互式连接,即在mysql_real_connect()函数中使用了CLIENT_INTERACTIVE选项。

  1. 说得直白一点,通过mysql客户端连接数据库是交互式连接,通过jdbc连接数据库是非交互式连接。

2> 在连接启动的时候,根据连接的类型,来确认会话变量wait_timeout的值是继承于全局变量wait_timeout,还是interactive_timeout。

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