The last packet sent successfully to the server was 零 milliseconds ago
The last packet sent successfully to the server was 0 milliseconds ago.今天在使用JDBC操作mysql时遇
The last packet sent successfully to the server was 0 milliseconds ago.
今天在使用JDBC操作mysql时遇到下面的异常信息：
配置：ubuntu10.105.1.49-1ubuntu8.1mysql-connector-java-5.1.18.jar
交互：
300k records
300k * 10 = 3M次访问mysql
处理时间0.5h以内
解决方法：
（1）使用JDBC URL中使用autoReconnect属性，url添加
&autoReconnect=true&failOverReadOnly=false&maxReconnects=10
（2） 修改MySQL的参数. /etc/my.cnf 添加
[mysqld]wait_timeout=31536000interactive_timeout=31536000
（3）重启mysql
service mysql restart
原因分析：
（1）大量数据访问情况下，mysql connection连接有可能失效
（2）长时间不妨问，connection会失效
更多参考：
http://dev.mysql.com/doc/refman/5.1/zh/database-administration.html#dynamic-system-variables
http://www.blogjava.net/heweiya/archive/2006/01/18/28483.html
1 楼 hhsc00 2012-05-15 连接字符串URL中，将localhost改成127.0.0.1，就OK了。
原因见：
Testing your connectivity with the mysql command-line client will not work unless you add the –host flag, and use something other than localhost for the host. The mysql command-line client will use Unix domain sockets if you use the special host name localhost. If you are testing connectivity to localhost, use 127.0.0.1 as the host name instead.
引用自：http://dev.mysql.com/doc/refman/5.0/en/connector-j-usagenotes-troubleshooting.html
我的异常网推荐解决方案：The driver has not received any packets from the server.,http://www.myexception.cn/j2ee/345243.html
