MySQL连接超时相关的两个参数interactive_timeout和wait_timeout的区别及解释

本篇内容主要讲解“MySQL连接超时相关的两个参数interactive_timeout和wait_timeout的区别及解释”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“MySQL连接超时相关的两个参数interactive_timeout和wait_timeout的区别及解释”吧!

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
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
The number of seconds the server waits for activity on a noninteractive connection before closing it.
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.


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。
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。 


interactive_timeout：交互式连接超时时间(mysql工具、mysqldump等)
wait_timeout：非交互式连接超时时间，默认的连接mysql api程序,jdbc连接数据库等
 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。


如何设置和查看:
mysql> set global interactive_timeout=1800;
Query OK, 0 rows affected (0.00 sec)


mysql> set global wait_timeout=1800;
Query OK, 0 rows affected (0.00 sec)


mysql> show global variables like 'interactive_timeout';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| interactive_timeout | 1800  |
+---------------------+-------+
1 row in set (0.00 sec)


mysql> show global variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 1800  |
+---------------+-------+
1 row in set (0.00 sec)

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