MySQL

1. Use MyISAM instead of InnoDB To be completely wrong or to refute a reason: First of all, the original said MyISAM is used by default, and actually to the MySQL 5.5.x,innodb has become the default table engine. In addition, the simple use of

PHP page UTF-8 encoding problem 1. Add a line to the beginning of the code: Copy Code code as follows: Header ("Content-type:text/html;charset=utf-8"); 2.PHP file Encoding Problem Click on the Editor's menu: "File"-> "Save As"

This article is an example of how to implement XML and MySQL data conversion in PHP. Share to everyone for your reference. The specific analysis is as follows: This provides a mysql2xml conversion class that can quickly convert XML to MySQL while

First of all, why not build their own apache,php and MySQL environment separately? So that they can learn more knowledge, it is more cool to say. But perhaps because I am lazy, I am the kind of "since have ready-made, use is" person. A gentleman's

Even though we have powerful reporting tools like the Microsoft Crystal Report and other flexible customer management tools in our current era, Microsoft Excel is still the most common tool when analyzing sales statistics and revenue information.

Whether in a small, free database space or a large e-commerce site, a reasonable design of the table structure, the full use of space is very necessary. This requires us to have a good understanding of the common data types of database systems.

When the amount of physical memory does not fit the data, the OS writes the data in virtual memory to disk, where the exchange is transparent to the process running in the operating system. The exchange pair has a great effect on MySQL performance,

In a previous article on MySQL architecture, it was mentioned that MySQL's biggest feature is its pluggable plug-in storage engine, which contrasts several major storage engines. In particular, MySQL is open source, so if you're not satisfied with

As a good programmer, in addition to writing a large number of programs, creating a large number of databases is inevitable. In the past few years, the author has created and managed a large number of MySQL databases, in the process used a variety

· If the top tool for UNIX or Windows Task Manager shows that the CPU usage of your database workload is less than 70%, your workload may be disk bound, you may be generating too many transactions and submissions, or the buffer pool is too small.

DatabaseA database (DATABASE,DB) is a collection of organized, shareable data that is stored in a computer for a long period of time. The data in the database is organized, described and stored in a certain mathematical model, with small redundancy,

First step: Download.A. As the saying goes: "Paddle"! I use the ZIP Archive version of this, Win7 64-bit machine support this, so I suggest to use this. Because it's simple, and it's clean.Address see the bottom of the picture, see clearly the 64bit

Experimental introduction: MySQL root password is missing, unable to log in. Need to reset its root passwordEnvironment Introduction: Compiling and installing MySQLThis blog introduction to retrieve the MySQL root password is mysql based on the

One, CONCAT () functionThe CONCAT () function is used to concatenate multiple strings into a single string.Use data table info as an example, where select Id,name from Info LIMIT 1, and the returned result is+----+--------+| ID | name |+----+--------

Saiku database tables and users are created by default when the project is started, by initializing the h2database in the Saiku-beans.xml This bean executes the Init method of the Org.saiku.service.Database class to initialize the data table and the

Basic concept of the database "> Basic concepts of relational databases Database :An efficient solution for managing large amounts of information.A library that organizes, stores, and manages data in accordance with its data structure .

A semi-synchronous configuration of MySQL was completed in the previous article.Link: in Centos7 to play MySQL semi-sync and Keepalived+mha (one), this article continues to complete the configuration of mha+keepalived. Role Ip

Use rmpbuild to create the AliSQL database rpm package, rmpbuildalisql Environment: REHL6.5 Software: rpmbuild Used files: ALiSQL-Master1. install required software [root@alisql ~]# yum install rpm* rpm-build rpmdev* –y [root@alisql ~]#

Explain analyzes SQL efficiency and explain SQL Efficiency The Explain command is the first recommended command for solving database performance. Most performance problems can be solved simply by using this command. The Explain command can be used

In linux, mysql enables the remote access permission firewall to open port 3306 and mysql3306. Enable mysql Remote Access Permissions By default, mysql users do not have the permission for remote access. Therefore, when the program is not on the