mysql 8小时空闲后连接超时的问题

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mysql 8小时空闲后连接超时的问题_MySQL

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Jun 01, 2016 pm 01:55 PM

appdatabase

　　问：怎样才能解决mysql 8小时空闲后连接超时的问题？

　　答：当应用程序和数据库建立连接时，如果超过了8个小时，应用程序句不会去访问数据库，数据库就会出现断掉连接的现象。这时再次访问就会抛出异常，异常如下：

Communications link failure due to
underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
　　at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
　　at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2304)
　　at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2803)
　　at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
...

　　一般的解决方法大多是在数据库连接字符串中增加“autoReconnect=true ”选项。但是这只对mysql4以前的版本有效。在最新的mysql中是无效的。其实要解决这个问题也有一个简单的方法，就是修改mysql的启动参数。缺省情况下mysql的timeout时间是28800秒，正好是8小时，增加一个0就可以了。

　　同理也可以在" my.ini"文件中增加此参数。

mysqld-nt --default-table-type=innodb --interactive_timeout=288000

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