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服务器mysql及c3p0设立

Jun 07, 2016 pm 04:16 PM
C3 mysql server

服务器mysql及c3p0设置 1)interactive_timeout: 参数含义:服务器关闭交互式连接前等待活动的秒数。交互式客户端定义为在mysql_real_connect()中使用CLIENT_INTERACTIVE选项的客户端。 参数默认值:28800秒(8小时) (2)wait_timeout: 参数含义:服务器关闭非

服务器mysql及c3p0设置
1)interactive_timeout:
参数含义:服务器关闭交互式连接前等待活动的秒数。交互式客户端定义为在mysql_real_connect()中使用CLIENT_INTERACTIVE选项的客户端。
参数默认值:28800秒(8小时)

(2)wait_timeout:
参数含义:服务器关闭非交互连接之前等待活动的秒数。
在线程启动时,根据全局wait_timeout值或全局interactive_timeout值初始化会话wait_timeout值,取决于客户端类型(由mysql_real_connect()的连接选项CLIENT_INTERACTIVE定义)。
参数默认值:28800秒(8小时)

MySQL服务器所支持的最大连接数是有上限的,因为每个连接的建立都会消耗内存,因此我们希望客户端在连接到MySQL Server处理完相应的操作后,应该断开连接并释放占用的内存。如果你的MySQL Server有大量的闲置连接,他们不仅会白白消耗内存,而且如果连接一直在累加而不断开,最终肯定会达到MySQL Server的连接上限数,这会报'too many connections'的错误。对于wait_timeout的值设定,应该根据系统的运行情况来判断。在系统运行一段时间后,可以通过show processlist命令查看当前系统的连接状态,如果发现有大量的sleep状态的连接进程,则说明该参数设置的过大,可以进行适当的调整小些。

问题:
   如果在配置文件my.cnf中只设置参数wait_timeout=100,则重启服务器后进入,执行:
   Mysql> show variables like “%timeout%”;
会发现参数设置并未生效,仍然为28800(即默认的8个小时)。
查询资料后,要同时设置interactive_timeout和wait_timeout才会生效。
【mysqld】
wait_timeout=100
interactive_timeout=100
重启MySQL Server进入后,查看设置已经生效。


如果不重启数据库的话,可以通过下面方法设置
set global wait_timeout=100
set global interactive_timeout=100


在本次服务器中做了如下处理,记录如下:

修改项目中配置文件 jdbc.properties 文件中下面三个参数数值

cpool.checkoutTimeout=450
cpool.maxIdleTime=600
cpool.maxIdleTimeExcessConnections=300

修改mysql中配置文件 my.ini

添加下面两行内容:
wait_timeout=800
interactive_timeout=800
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