MySQL

Content from http://my.oschina.net/u/142836/blog/169415Optimization using and optimizing the DBEstablish the appropriate index:Try to get all queries indexed, this effect is very obvious.Table Space OptimizationOn a table that is frequently deleted

the development stage of database management technology 1, the artificial management stage data can not be long-term preservation, the program itself management data, data can not be shared, data is not independent. 2, File

The input data validation issue was encountered during the project. Using the MySQL5.5 database, the varchar type problem.Use this type to store the user name, which is set to 30 width.began to think that only 30 characters, 15 Chinese characters,

Test environment: Master:centos 6.6 (x86_64), Mysql5.6.22slave:windows 8 (x86_64), MySQL5.6.19 related nouns: master-slave copy, read/write separation, data backup Replication allows data from the master database to be replicated to multiple slave

mysql> select pname from product;+--------+| pname |+--------+| Product 1 || Product 2 || product Three |+--------+3 rows in Set (0.00 sec)This place is to say that all the pname from product are selected, a total of three records. The paging in

1, RPM-QA | grep MySQL//first check if MySQL 2 is installed, if installed, uninstall rpm-e MySQL 3\ http://dev.mysql.com/downloads/mysql/4, 5, Groupadd MySQL//CAN To see if this user group exists more/etc/group more/etc/passwd6\ useradd-g mysql

Create a backup directory here, take/root/bak/mysql as an example:cd mkdir bakcd bakmkdir mysql touch an sh under/usr/sbin: cd/usr/sbintouch mydbbackup.sh Span style= "font-size:15px;" The contents are as follows: #!/ Bin/bash

View, which combines some data from a base table into a form of a virtual table, is called virtual because it exists only when the view is used in a single statement. At the same time, if the data in the view is modified, the data in the base table

CentOS6.5 Create, back up, and restore MySQL databases from the shellTo create a database:Mysql-uroot-p123456-e "CREATE DATABASE IF not EXISTS yourdatabasename DEFAULT CHARSET UTF8 COLLATE utf8_general_ci;"To back up the database:mysqldump-uroot-p123

Today, I installed MySQL on Linux, which is a centos system, and I use Yum to install it.Yum install mysql-server mysql-devel mysqlThere are some problems when modifying the storage directory of the data, recording the steps.Default data store

Database A as the primary service, database B as a synchronous library (note: Both sides of the database library must be one, or there will be constant error information out, change, change, is not successful) 1. Configure Master

1 Increase of two fields:[SQL]View Plaincopy mysql> Create table id_name (id int,name varchar (20)); Query OK, 0 rows affected (0.13 sec) mysql> alter table Id_name add age int,add address varchar (11); Query OK, 0 rows affected (0.

Create Algori ' sync_user ' Create algorithm=undefined definer= ' root ' @ ' localhost ' SQL SECURITY definer VIEW ' sync_db '. ' Sync_user ' AS Select' Ipt_authd_remote '. ' User '. ' user_login_name ' as ' user_login_name ',' Ipt_authd_remote '. '

For MySQL backup different DBA, have different preferences!Let me first enumerate the following methods:1. Use the MySQL automatic Dump tool, with the shell and then crontab execution;2.XtraBackup (These years compared to the fire bar)Description:

Original: MySQL programming in C (i)Beginner MySQL, record the problem that MySQL has encountered when programming in C language.This is my source program:1 intMainvoid)2 {3MYSQL *mysql=NULL;4 5 6 if((Mysql=mysql_init (mysql)) = =NULL)7 {8fprintf

MySQL paging implementation Mysql> select pname from product; + -------- + | pname | + -------- + | product 1 | product 2 | product 3 | + -------- + 3 rows in set (0.00 sec)In this case, all pnames are selected from the product. There are three

Mysql slow query usage 1. Definition of slow Query Mysql records all SQL statements that have been executed beyond the time threshold set by the long_query_time parameter. Slow query logs are the logs that record these SQL statements. 2. Enable slow

Configure master/slave Data Synchronization and backup for centos6 mysql5.5   Database A serves as the primary service, and database B serves as the synchronization database (note: the databases on both sides must be one-to-one, or there will be

An error occurred while setting up the mysql-mmm environment. The following information is displayed when mmm_contorl show is executed after monitor is started. ERROR: Can't connect to monitor daemon! Solution: Modify configuration file Set

Data constraints and SQL statement constraints for SQL statementsData constraints of SQL statements   What is data constraints? Data constraints are used to restrict unauthorized data modification operations.   1. Default Value of the constraint