mysql数据库设置超时断开连接

mysql数据库长时间未操作自动断开连接由参数：interactive_timeout和wait_timeout控制，默认都是8小时（28800分钟）
mysql> show variables like '%timeout%';
+-----------------------------------+----------+
| Variable_name                     | Value    |
+-----------------------------------+----------+
| connect_timeout                   | 10       |
| delayed_insert_timeout            | 300      |
| have_statement_timeout            | YES      |
| innodb_flush_log_at_timeout       | 1        |
| innodb_lock_wait_timeout          | 50       |
| innodb_rollback_on_timeout        | OFF      |
| interactive_timeout               | 28800    |
| lock_wait_timeout                 | 31536000 |
| mysqlx_connect_timeout            | 30       |
| mysqlx_idle_worker_thread_timeout | 60       |
| mysqlx_interactive_timeout        | 28800    |
| mysqlx_port_open_timeout          | 0        |
| mysqlx_read_timeout               | 30       |
| mysqlx_wait_timeout               | 28800    |
| mysqlx_write_timeout              | 60       |
| net_read_timeout                  | 30       |
| net_write_timeout                 | 60       |
| rpl_stop_slave_timeout            | 31536000 |
| slave_net_timeout                 | 60       |
| wait_timeout                      | 28800    |
+-----------------------------------+----------+
20 rows in set (0.02 sec)

修改interactive_timeout和wait_timeout即可设置长时间未操作自动断开连接。

修改interactive_timeout和wait_timeout为15分钟（将参数添加到my.cnf参数文件）。

步骤：
1.停止当前数据库
[root@node01 ~]# /etc/init.d/mysqld stop
Shutting down MySQL... SUCCESS!

2.修改参数文件添加以下参数
interactive_timeout=15
wait_timeout=15

3.重启数据库
[root@node01 ~]# /etc/init.d/mysqld start
Starting MySQL.. SUCCESS!

4.查看修改后的参数
mysql> show variables like '%timeout%';
+-----------------------------------+----------+
| Variable_name                     | Value    |
+-----------------------------------+----------+
| connect_timeout                   | 10       |
| delayed_insert_timeout            | 300      |
| have_statement_timeout            | YES      |
| innodb_flush_log_at_timeout       | 1        |
| innodb_lock_wait_timeout          | 50       |
| innodb_rollback_on_timeout        | OFF      |
| interactive_timeout               | 15       |
| lock_wait_timeout                 | 31536000 |
| mysqlx_connect_timeout            | 30       |
| mysqlx_idle_worker_thread_timeout | 60       |
| mysqlx_interactive_timeout        | 28800    |
| mysqlx_port_open_timeout          | 0        |
| mysqlx_read_timeout               | 30       |
| mysqlx_wait_timeout               | 28800    |
| mysqlx_write_timeout              | 60       |
| net_read_timeout                  | 30       |
| net_write_timeout                 | 60       |
| rpl_stop_slave_timeout            | 31536000 |
| slave_net_timeout                 | 60       |
| wait_timeout                      | 15       |
+-----------------------------------+----------+
20 rows in set (0.00 sec)

5.验证
mysql> select user,host from mysql.user;
ERROR 2013 (HY000): Lost connection to MySQL server during query

未操作时间达到15分钟，连接自动断开。