修改wait_timeout
 
mysql 
mysql> show global variables like 'wait_timeout'; 

 

其默认值为8小时 
mysql的一个connection空闲时间超过8小时,mysql会自动断开该连接。 
 
1.修改配置 
vi /etc/my.cnf 

[mysqld] 
wait_timeout=10 

# /etc/init.d/mysql restart 

2.直接用sql命令行修改 
mysql> set global wait_timeout=10; 
mysql> show global variables like 'wait_timeout'; 
+----------------------------+-------+ 
| Variable_name              | Value | 
+----------------------------+-------+ 
| wait_timeout               | 10    | 
+----------------------------+-------+ 


show variables like '%time%'; 


timeBetweenEvictionRunsMillis = 20000 
#dbcp每2000秒进行一次connection的检 
minEvictableIdleTimeMillis = 28700 
#每次检验中将超过28700秒处于空闲的connection断开