MySQL

The connection to the mySQL database fails frequently. Why? A year ago, I developed a website that rented a virtual space of PHP + mySQL in linux and has been working normally before. Over the past six months, database connection failures have

The MySQL stored procedure is a new feature added since MySQL 5.0. The advantages of stored procedures are as follows. However, the most important thing is the execution efficiency and SQL code encapsulation. In particular, the SQL code

I have a website that was previously created using asp.net. The database used is sqlserver, and I plan to use the PHP + MYSQL architecture. Because the original site has a certain ranking, a direct revision will lead to many error pages. It takes a

Today, I found that the mysql DATA folder with a backup has become abnormal. I found that there are three more files: ibdata1 ib_logfile0 ib_logfile1, the former is 18 m, and the latter two are 5 m each, it turned out that the migration was from

Test Table 1? 1 2 3 4 5 6 7 8 Drop table if exists test; Create table test ( Id bigint (11) unsigned not null AUTO_INCREMENT, Name varchar (100) not null default '', Type varchar (100 ), Create_time datetime, Primary key (ID) )

When I used load data to import the data in the txt file to mysql today, I found this error because the value in the foreign key does not exist in the associated table. Load data local infile "E:/javaTest/SQL .txt" into table questionFIELDS

The following describes the advantages and disadvantages of each solution.Solution 1:Copy codeThe Code is as follows: SELECT * FROM 'table' order by rand () LIMIT 0, 1;This method is very slow. The reason is that MySQL creates a zero-time table to

Remove left space in mysql:LTRIM (str)Returns the string str with leading space characters removed.The following is a code snippet:Copy codeThe Code is as follows:Mysql> select ltrim ('barbar ');-> 'Barbar' This function is multi-byte safe.Remove

Mysql converts the character encoding of a table to UTF-8.Copy codeThe Code is as follows:Alter table tb_anniversary convert to character set utf8; Modify mysql character encoding to UTF8 Step 1: view the current character encoding methodCopy

MySQL has provided the optimizer Option Switch option since 5.1. In this way, we can force some things that we think should not be done when the optimizer is confused, or when we want to see why the optimizer is so selective, you can manually

/* -- Bcp-Import and Export of binary files Supports import/export of image, text, and ntext Fields Image is suitable for binary files; text and ntext are suitable for text data files. Note: during import, all rows meeting the conditions will be

Mysql has many versions and storage engines. to select the most suitable system for business use, some verification is required. This article describes the mysql verification process and ideas. It mainly involves: Mysql version V Mariadb V Tokudb V

Like installing many software, if it is the second installation, it is much more complicated than the first installation. Many things may not be installed because they are not deleted. This installation is an example. The following describes how to

1. After wamp is installed, run the WampServer program and go to the MYSQL console; 2. After Entering the console, the system prompts you to enter the password (no password is required because the password is blank). Press enter to enter; 3. Enter "

The description of Replace is similar to the insert statement. If an old record in the table has the same value as a new record used for the primary key or a UNIQUE index, the old record is deleted before the new record is inserted. Unless the table

In MySQL, tables of the InnoDB Engine type support foreign key constraints.Usage conditions of foreign keys:1. The two tables must be InnoDB tables, and MyISAM tables do not currently support foreign keys (it is said that foreign keys may be

This article provides two different ways to add users: using the GRANT statement or directly operating the MySQL authorization table. The better way is to use the GRANT statement, because they are more concise and seem to have fewer errors. The

This article is the second Monty speech at the o'reilly Open Source Convention 2000 conference, this article describes how to optimize applications, use portable applications, speed up, optimize MySQL, compile and install MySQL. VI,Optimize

Mysql master-slave Database Synchronization time: Source: Network Author: PHP100er CLICK: 292 Times [font size: large medium small] environment: master server: centos 5.2 mysql 5.1.35 source code IP: 192.168.1.22 slave server: centos 5.2 mysql 5.1.35

1. The configuration file is correct and the cache is cleared. 1. if you encounter this problem, do not rush to reinstall the MySQL database. In fact, the solution is very simple. You need to clear the WIndows cache directory. 2. Press "windows key +