Lost connection to MySQL server at 'reading authorization packet', system error: 0

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Lost connection to MySQL server at 'reading authorization packet', system error: 0_MySQL

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Jun 01, 2016 pm 01:05 PM

authorizationreading

1.进入Mysqld

如果已经设置Mysql/Bin环境变量，直接在CMD里输入命令，如果没有设置Mysql环境变量，去Mysql安装目录的Bin文件夹里运行

F:\AppServ\MySQL\bin\mysql.exe -u root -p

其中root是用户名，然后就可以进入Mysql命令行环境了

2.以后的每一句Mysql命令，每次都要以分号；为结束标识，而不是以回车。

3.注意，，每次都需要重启Mysql才可以使设置生效！！

当然了，如果你直接在Mysql安装目录的 my.ini加上设置值，则可以在Mysql启动时加载设置。比如connect_timeout = 120

然后是需要更改什么参数解决这个问题

当WEB服务器负载高的时候，经常会出现这种错误，

原因：

MySQL默认connect_timeout是5秒，超过了这个时间MySQL的server端就会返回“Bad handshake”。

解决办法：

1.大多数时候设置"set global connect_timeout=60;"是可以解决问题的;

我们可以通过执行“SHOWSTATUS LIKE 'aborted%'”，可以观察到 Variable_name Value
Aborted_clients 6
Aborted_connects 15010

觉得是否要增加connect_timeout的时间，"Aborted_connects"将会随着服务端放弃客户端初始连接而增加。如果"Aborted_connects"很大，并且不断增加，就需要增加"connect_timeout".

2.在MySQL的配置文件中[mysqld]添加"skip-name-resolve",减少域名解析的时间
3.部署服务器端的网络要好，至少大于100Mbps/s
4.如果是在调用mysql_query的时候出现的问题，那就需要把"net_read_timeout"的时间调成30秒，或者60秒，或者更大的值
5.如果还不能解决问题，那估计是你的SQL语句中含有BLOB这种大类型，我们就需要增加"max_allowed_packet"的值了

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