


MySQL server has gone away - How to solve MySQL error: MySQL server connection is disconnected, specific code examples are needed
- Introduction
MySQL is a popular open source relational database management system that is widely used for back-end data storage and management of websites and applications. However, when using MySQL, you sometimes encounter the "MySQL server has gone away" error, which means that the connection between the MySQL server and the client has been disconnected. This article explains how to solve this problem, including specific code examples.
- Cause analysis
When the connection between the MySQL server and the client is disconnected, there may be the following reasons:
2.1 Connection timeout: When MySQL When the server does not receive any data from the client within the set time range, it will automatically close the connection. This could be due to a network issue or a connection timeout caused by high server load.
2.2 Data is too large: If the amount of data to be transferred exceeds the maximum limit allowed by the MySQL server, the MySQL server may actively close the connection.
2.3 Server configuration issues: Certain configuration parameters of the MySQL server may cause the connection to be closed, for example, the max_allowed_packet parameter is too small.
- Solution
In order to solve the "MySQL server has gone away" error, we can take the following measures:
3.1 Increase the timeout: You can pass Modify the MySQL server and client configuration files to increase the timeout. For example, in the configuration file my.cnf of the MySQL server, increase the value of the wait_timeout parameter to a larger value, in seconds.
3.2 Increase the value of the max_allowed_packet parameter: If the data is too large and the connection is closed, it can be solved by increasing the value of the max_allowed_packet parameter. In the configuration file my.cnf of the MySQL server, increase the value of the max_allowed_packet parameter to the appropriate size, such as 100M.
3.3 Regular heartbeat detection: In order to keep the long-term connection active, heartbeat messages can be sent to the MySQL server regularly. The following is a sample code written in Python:
import mysql.connector config = { 'user': 'username', 'password': 'password', 'host': 'localhost', 'database': 'database_name', 'raise_on_warnings': True, } cnx = mysql.connector.connect(**config) cursor = cnx.cursor() # 执行心跳查询 query = "SELECT 1" cursor.execute(query) # 关闭游标和连接 cursor.close() cnx.close()
The above code uses the mysql.connector module to connect to the MySQL server and issue a simple query to keep the connection to the server active.
3.4 Check the server load: If the connection timeout is caused by high server load, you can consider optimizing the query and index, or use a distributed database solution.
- Summary
When using MySQL, you may encounter the "MySQL server has gone away" error, including connection timeout, excessive data, and server configuration issues. . In order to solve this error, we can increase the timeout, adjust the max_allowed_packet parameter value, perform regular heartbeat detection, and optimize the server load. We hope that the solutions and code examples provided in this article can help readers solve the problem of MySQL connection disconnection.
The above is the detailed content of MySQL server has gone away - How to solve MySQL error: MySQL server connection is disconnected. For more information, please follow other related articles on the PHP Chinese website!

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于架构原理的相关内容,MySQL Server架构自顶向下大致可以分网络连接层、服务层、存储引擎层和系统文件层,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用char()和REPLACE()函数来替换换行符;REPLACE()函数可以用新字符串替换列中的换行符,而换行符可使用“char(13)”来表示,语法为“replace(字段名,char(13),'新字符串') ”。

方法:1、利用right函数,语法为“update 表名 set 指定字段 = right(指定字段, length(指定字段)-1)...”;2、利用substring函数,语法为“select substring(指定字段,2)..”。

mysql的msi与zip版本的区别:1、zip包含的安装程序是一种主动安装,而msi包含的是被installer所用的安装文件以提交请求的方式安装;2、zip是一种数据压缩和文档存储的文件格式,msi是微软格式的安装包。

转换方法:1、利用cast函数,语法“select * from 表名 order by cast(字段名 as SIGNED)”;2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于MySQL复制技术的相关问题,包括了异步复制、半同步复制等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了mysql高级篇的一些问题,包括了索引是什么、索引底层实现等等问题,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用REGEXP运算符判断数据是否是数字类型,语法为“String REGEXP '[^0-9.]'”;该运算符是正则表达式的缩写,若数据字符中含有数字时,返回的结果是true,反之返回的结果是false。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Dreamweaver CS6
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
