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[数据库]MySQL ERROR Got an error reading communication packets


介绍

经常会在错误日志中看到这个报错,复制官方文档的解释。   

 

Aborted_connects 

If a client is unable even to connect, the server increments the Aborted_connects status variable. Unsuccessful connection attempts can occur for the following reasons:

  • A client attempts to access a database but has no privileges for it.

  • A client uses an incorrect password.

  • A connection packet does not contain the right information.

  • It takes more than connect_timeout seconds to obtain a connect packet. See Section 5.1.4, “Server System Variables”.


If these kinds of things happen, it might indicate that someone is trying to break into your server! If the general query log is enabled, messages for these types of problems are logged to it.

 

对于Aborted_connects错误的大概原因有:客户端连接一个没有授权的数据库、密码错误、连接包信息错误、连接超时(默认10s)

Aborted_clients

If a client successfully connects but later disconnects improperly or is terminated, the server increments the Aborted_clients status variable, and logs an Aborted connection message to the error log. The cause can be any of the following:

  • The client program did not call mysql_close() before exiting.

  • The client had been sleeping more than wait_timeout or interactive_timeout seconds without issuing any requests to the server. See Section 5.1.4, “Server System Variables”.

  • The client program ended abruptly in the middle of a data transfer.


Other reasons for problems with aborted connections or aborted clients:

  • The max_allowed_packet variable value is too small or queries require more memory than you have allocated for mysqld. See Section B.5.2.10, “Packet Too Large”.

  • Use of Ethernet protocol with Linux, both half and full duplex. Some Linux Ethernet drivers have this bug. You should test for this bug by transferring a huge file using FTP between the client and server machines. If a transfer goes in burst-pause-burst-pause mode, you are experiencing a Linux duplex syndrome. Switch the duplex mode for both your network card and hub/switch to either full duplex or to half duplex and test the results to determine the best setting.

  • A problem with the thread library that causes interrupts on reads.

  • Badly configured TCP/IP.

  • Faulty Ethernets, hubs, switches, cables, and so forth. This can be diagnosed properly only by replacing hardware.

 

对于 Aborted_clients的原因大概有:客户端没有执行mysql_close()关闭、由于连接一直没有关闭导致时间超过wait_timeout or interactive_timeout这两个变量的值(这两个变量的超时时间是8小时)、客户端在程序执行过程中结束、max_allowed_packet包设的过小、网络原因、线程bug等


总结

 

 

 

备注:

    作者:pursuer.chen

    博客:http://www.cnblogs.com/chenmh

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