终止空闲的 mysql 连接

2021-11-20 00:00:00 python-idle wait timeout kill mysql

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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