Mysql interactive_timeout和wait_timeout参数

官网解释:​​https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html​​

​

interactive_timeout = 28800 wait_timeout = 28800 #这两个参数默认都是28800s，即8个小时; interactive_timeout指的是mysql在关闭一个交互的连接之前所要等待的秒数 wait_timeout指的是mysql在关闭一个非交互的连接之前所要等待的秒数 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 ​

如果设置过大，则可能会产生大量的sleep进程，如果设置过小，可能会产生如下错误：

​

mysql> show variables like 'interactive_timeout';
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    2
Current database: *** NONE ***

1.查看默认值

mysql> show variables like 'interactive_timeout';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| interactive_timeout | 28800 |
+---------------------+-------+
1 row in set (0.01 sec)

mysql> show variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 28800 |
+---------------+-------+
1 row in set (0.00 sec)

2.根据生产经验需要将该参数设置为300，也就是5分钟​

[root@mysql57 ~]# cat /etc/my.cnf | grep timeout
wait-timeout = 300
interactive_timeout = 300
[root@mysql57 ~]# service mysqld restart
Shutting down MySQL.... SUCCESS! 
Starting MySQL... SUCCESS! 
mysql> show variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 300   |
+---------------+-------+
1 row in set (0.00 sec)

mysql> show variables like 'interactive_timeout';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| interactive_timeout | 300   |
+---------------------+-------+
1 row in set (0.00 sec)

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MYSQL