MySQL

MySQL binary log is often said to be the Bin-log, is the MySQL implementation of the changes produced by the binary logging file, its main role is two:* Data reply* Master-slave database. For the slave side to perform additions and deletions to

http://zhangzhaoaaa.iteye.com/blog/1689412 reference: "MySQL Technology insider SQL Programming"SELECT DISTINCT From lefttablejoin On WhereGroup Bywith{cube| ROLLUP}HavingOrder byLimitProcessing order From On Join where GROUP BY

Question: How do I design or optimize a big table for tens? In addition, there is no other information, the personal feel that this topic is a little fan, have to simply say how to do, for a storage design, must consider the business characteristics,

http://database.51cto.com/art/201108/280088.htm when creating foreign keys in the MySQL database , there are often some errors that can be frustrating. A typical error is: Can ' t create Table ... The error. In many instances, this kind of error

http://www.jzxue.com/shujuku/mysql/201109/06-8742.html MySQL The syntax for establishing foreign KEY constraints is too obscure to understand, and has to write down notes.1. Create a foreign key when building a tableCREATE TABLE table_s ( ' id '

Many MySQL programs come with the ability to log on anonymously. After you've just installed MySQL, you can log in to the database.This is basically nothing to use MySQL, but if we want to deploy the database, this type of login can never exist!

http://blog.csdn.net/wh62592855/article/details/6777753There are several cryptographic functions under MySQL.PASSWORD (): Creates an encrypted password string that is appropriate for the security system inserted into MySQLEc The encryption process

1.AVG () Usage: Averaging Example: Mysql> Select * fromT1;+----+------+----------+---------+-------+-------+|Id|Name|Password|test001|Test3|Test4|+----+------+----------+---------+-------+-------+| 2 | 1 | 1 | 1 | 1 | 1 ||

this article starting at Slime Line the world . 1 , Basic knowledgeThe log is to record every change in the database into a dedicated file, which is called a log file. MySQL only turns on the error log by default, because too many logs can affect

Content for their own a little summary, if there is no welcome unveils to shoot bricksThis article from http://yijiu.blog.51cto.com/reprint please Chingbo Lord agree, pirated shamefulMonitor master-slave replication normal or notAs you should know,

variable Scopeinternal variables enjoy higher precedence within their scope when executed to end. variable, the internal variable disappears, and the variable is no longer visible at this time outside its scope, and should be storedthe declared

Install discuz! under PHP After completion point into BBS error:discuz! Info: MySQL Query Errortime: 2014-11-6 8:23amScript:/discuz7/bbs/index.phpSQL: SELECT type from [table]usergroups WHERE groupid= ' 7 'Error: Table ' Discuz. [table]usergroups '

Install MySQL   1 with yum under Linux, install to see if it has been installed:           Yum list installed mysql*     &NBSP ;     RPM-QA | grep mysql*   See if there is an installation package:           Yum list mysql*   install MySQL client:    

MySQL Setup encoding version mysql-5.6.21-winx64 MySQL default encoding: mysql> show variables like  ' character% '; +--------------------------+------------------- --------------------------+| variable_name             | Value                      

Today classmate Discuz upgrade appears the primary key duplication, resulting in data insertion unsuccessful problem, and then looked up, said the method is to replace insert into with replace into, and then the replace into to the query, the

Originally can be done with the Shell function, now learn python, copy the changes. Complete the database backup. #!/usr/bin/python#-*-coding:utf-8-*-#MYSQL  backimport string,time,os,datetimeimport sys,logging , Statimport subprocess#os.environ.

View Apache version/usr/sbin/apachectl-vHttpd-vinstallation directory, using APACHECTL-VView MySQL versionMysql–help | grep distribMysql-vMysql/bin/mysql-u root-p-E "select version ()" /bin mysqladmin Version View Linux

MySQL database MyISAM storage engine to InnoDB before the company's database storage engine is all MyISAM, the amount of data and access is not very large, so there is no problem. But recently the MySQL data table is often locked, directly caused

1, [root@localhost ~]# mysql-u root-p2. mysql> use MySQL3. Mysql> Grant all privileges on * * to ' root ' @ '% ' identified by ' password ' with GRANT OPTION;4, mysql> FLUSH privileges;5, mysql> select Host,user,password from user;All privileges

Mysql_ping () and MYSQL_OPT_RECONNECTMySQLserverhasgoneaway "errorSource: http://www.felix021.com/blog/read.php? 2102Yesterday @ Zind found my previous blog (modified), which mentioned mysql_ping and MYSQL_OPT_RECONNECT.The reason for writing this