近一段时间，很多部门同事反映在使用mysql的过程出现数据库连接自动断开的问题，我对该问题做了一些实验。
关于mysql自动断开的问题研究结果如下，在mysql中有相关参数设定，当数据库连接空闲一定时间后，服务器就
会断开等待超时的连接：
1、相关参数，红色部分
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  |
| wait_timeout             | 28800 |
+--------------------------+-------+        
同一时间，这两个参数只有一个起作用。到底是哪个参数起作用，和用户连接时指定的连接参数相关，缺省情况下是使用
wait_timeout。我建议是将这两个参数都修改，以免引起不必要的麻烦。

2、修改参数
这两个参数的默认值是8小时。我测试过将这两个参数改为0，结果出人意料，系统自动将这个值设置为1。换句话说，不能将该值设置为永久。我建议为参数值加三个0，这样肯定可以满足我们的应用要求。

修改操作：打开/etc/my.cnf,在属性组mysqld下面添加参数如下：
[mysqld]
interactive_timeout=28800000
wait_timeout=28800000

[*map/map_all_coml10.txt||10||r||1|| @]

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