我有一个rails 4应用程序的问题，它留下了空闲的mysql连接 . 在我们查看代码以确定原因时，我至少希望能够自动消除违规流程 . mysql文档说设置wait_timeout和interactive_timeout将关闭非活动连接，所以我将它们都设置为300.但是，如下所示，有各种进程超过300限制 . 我已经确认设置确实是300.为什么mysql不能消除这些进程？
mysql> show processlist;
+-----+--------------+-----------+--------------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+--------------+-----------+--------------+---------+------+-------+------------------+
| 143 | application | localhost | application | Sleep | 1500 | | NULL |
| 144 | application | localhost | application | Sleep | 1499 | | NULL |
| 145 | application | localhost | application | Sleep | 0 | | NULL |
| 146 | application | localhost | application | Sleep | 780 | | NULL |
| 147 | application | localhost | application | Sleep | 783 | | NULL |
| 148 | application | localhost | application | Sleep | 0 | | NULL |
| 149 | application | localhost | application | Sleep | 7 | | NULL |
| 150 | application | localhost | application | Sleep | 3 | | NULL |
| 151 | application | localhost | application | Sleep | 8 | | NULL |
| 152 | application | localhost | application | Sleep | 3 | | NULL |
| 155 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+-----+--------------+-----------+--------------+---------+------+-------+------------------+
11 rows in set (0.00 sec)