问题描述
我看到很多连接都打开并保持空闲很长时间，比如 5 分钟.
I see a lot of connections are open and remain idle for a long time, say 5 minutes.
是否有任何解决方案可以在不重新启动 mysql 服务的情况下从服务器终止/关闭它?
Is there any solution to terminate / close it from server without restarting the mysql service?
我正在维护一个旧的 PHP 系统，无法关闭为执行查询而建立的连接.
I am maintaining a legacy PHP system and can not close the connections those are established to execute the query.
我应该将 my.cnf 文件中的超时值减少到 8 小时吗?
Should I reduce the timeout values in my.cnf file those defaults to 8 hours?
# default 28800 seconds
interactive_timeout=60
wait_timeout=60
推荐答案
手动清理:
您可以杀死进程 ID.
Manual cleanup:
You can KILL the processid.
mysql> show full processlist;
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
| 1193777 | TestUser12 | 192.168.1.11:3775 | www | Sleep | 25946 | | NULL |
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
mysql> kill 1193777;
但是:
- php 应用程序可能会报告错误(或网络服务器，检查错误日志)
- 不要修复没有损坏的东西 - 如果您的连接不短缺，只需离开他们吧.
- the php application might report errors (or the webserver, check the error logs)
- don't fix what is not broken - if you're not short on connections, just leave them be.
或者您通过在 wait_timeout 和 interactive_timeout
Or you configure your mysql-server by setting a shorter timeout on wait_timeout and interactive_timeout
mysql> show variables like "%timeout%";
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| connect_timeout | 5 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| interactive_timeout | 28800 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| table_lock_wait_timeout | 50 |
| wait_timeout | 28800 |
+--------------------------+-------+
9 rows in set (0.00 sec)
设置:
set global wait_timeout=3;
set global interactive_timeout=3;
(也在你的配置文件中设置，当你的服务器重启时)
(and also set in your configuration file, for when your server restarts)
但是您正在治疗症状而不是根本原因 - 为什么这些联系是开放的?如果 PHP 脚本完成，它们不应该关闭吗?确保您的网络服务器没有使用连接池...
But you're treating the symptoms instead of the underlying cause - why are the connections open? If the PHP script finished, shouldn't they close? Make sure your webserver is not using connection pooling...
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