MySQL

In MySQL's MyISAM engine, there is one that is easy to overlook, called Compressed index Pack_keys, MyISAM uses prefix compression to reduce index size by compressing strings by default, or compressing integers You can use Pack_keys to control the

In reality, MySQL can build a composite index based on business needs, because MySQL uses the B-tree format index, you can locate records directly without scanning. MySQL establishes the principle of the leftmost prefix for multiple-column indexes,

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Sometimes when we manage the database we need to use the command to perform import and export operations, because this is stable and reliable, not easy to have garbled appearance. and the imported database size is unrestricted. MySQL Database

Mysqlhotcopy usage You need to install PERL-DBI and Dbd-mysql before using mysqlhotcopy: 1, the implementation of Yum install PERL-DBI installation perl-dbi.2, installation Dbd-mysql Please refer to the bottom material A common example of backup:

command line source Import Database: The code is as follows Copy Code 1, to move the imported. sql file to the bin file, this is a convenient path2, the 1th step with the above export3, enter mysql:mysql-u user name-PAs

Installation EnvironmentCentOS 5.4MySQL 5.1.xx with rpm direct installationxtrabackup 1.2.22 with rpm direct installation1. master:/etc/my.cnf The code is as follows Copy Code [Mysqld]Server-id = 1Log-binInnodb_flush_log_

Cases The code is as follows Copy Code mysqldump--default-character-set latin1-uroot-pxxx database name >/tmp/old.sql Similarly, the same is true for exports: The code is as follows Copy Code

First we want to enter your MySQL server, use net stop mysql to stop MySQL, and then run the DOS command, enter CMD in the run, and then switch to the MySQL bin directory, run the command: The code is as follows Copy Code

Method One, has the server Management permission modification method View database-level character set support The code is as follows Copy Code Mysql> show VARIABLES like character_set_% ';Mysql> show VARIABLES like

SQL statement: The code is as follows Copy Code UPDATE table_name Set Field_name=replace (field_name, ' from_str ', ' to_str ') Descriptiontable_name--the name of the tablefield_name--Field Namefrom_str--a

$ Errmsg = "";If (! @ Mysql_connect ("localhost", "trainee", "abc123 ")){$ Errmsg = "Cannot connect to database ";} @ Mysql_select_db ("wellho ");// First run ONLY-need to create table by un commenting this// Or with silent @ we can let it fail

$ Database = ''; // database tutorial name$ Options = array ('Hostname' => '', // IP address'Charset' => 'utf8', // encoding'Filename' => $ database. '. SQL', // file name'Username' => '','Password' =>'');Mysql_connect ($ options ['hostname'], $

Mysql_get_server_infoDefinition and usageThe mysql_get_server_info () function gets information about the MySQL server.This function returns MySQL server version success or FALSE failure.SyntaxMysql_get_server_info (connection)Parameter

Data verificationClear spacesThe trim function will clear spaces at the beginning and end of the data. Its syntax is:Trim ($ first_name );Processing of required fieldsSome fields must be entered in your database. In this way, the fields

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SQL statementSELECT *FROM (SELECT 'field', count (*) AS totalFROM 'table name'Group by 'Group field') AS tWHERE total> 10 and grouping fields <> ""This means that after the joint query, the data found by the group is processed as a condition. After

Note:An online MySQL database server suddenly loses power, causing system failure to start up. After you reinstall the system, find the previous MySQL database folder.Problem:By copying files to restore the previous MySQL database, we found that the