MySQL

Clevercode recently studied multiple instances of MySQL and found that there are two ways:The first is to use multiple configuration files to start different processes to implement multiple instances. The advantages of this approach are simple logic,

MySQL metrics (because this is not the difference between most search engines intentionally)Index (total index): Main indicator, no matter what the limitALTER TABLE ' table_name ' ADD INDEX index_name (' column ')Unique (unique index): Similar to

1. In case the database is connected and activated2. After the models has been written3. Operation of the Manage:Python manage.py validate validates the validity of the model,validate commands to check that your model's syntax and logic are

MySQL in the creation of user and authorization implementation method, for the first contact with MySQL friends can refer to the next Note: My operating environment is Widnows XP Professional + MySQL5.0 One, create the user:command: CREATE USER '

1: Use the show statement to find out what database currently exists on the server:mysql> SHOW DATABASES;2:2. Create a database Mysqldatamysql> CREATE DATABASE mysqldata;3: Select the database you createdmysql> use Mysqldata; (press ENTER to appear

One: What is a transactionBank Transfer! Zhang San 10000 to John Doe's account, which actually requires two SQL statements:To Zhang San's account minus 10000 yuan;Add 10000 yuan to John Doe's account.If the first SQL statement succeeds, the program

InnoDB and MyISAM are the two most common table types that many people use when using MySQL, both of which have pros and cons, and are different after 5.7.1. Transactions and foreign keysInnoDB has transactional, rollback, crash-repair capabilities

Although the development of MySQL + PHP can be used in PDO, but some of the older programs are not used, or other reasons1. Comment BypassSelect/*comment*/user/*zzsdsdsf*/from Mysql.user;2. Inline Comment Bypass/*!12345select*//*!12345user*/from

CentOS 6.2 Installation Compile mysql-5.5.37 # #多实例 principle is to install multiple instances after installing a single instanceFirst Yum InstallationYum install gcc gcc-c++ cmake ncurses-devel Bison1 single-instance MySQL database installation1.1

1. Using the JDBC Connection, address: http://dev.mysql.com/downloads/connector/j/2. Need to install Java (should be as long as JRE): http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html3. Install Java, reference:

Reload the MySQL method.Transfer from http://blog.sina.com.cn/s/blog_73000beb01012eh4.html1. Delete MySQL1.1sudo apt-Get Autoremove--Purge MySQL-Server-5.0 1.2 sudo apt- get remove mysql- server 1.3 -get autoremove mysql-server 1.4  sudo apt-get  

The environment is as follows:Centos6.5_64MySQL5.6.26master1:192.168.1.112master2:192.168.1.114MySQL InstallationHere is ignored, mainly is a careful. Sometimes a careless, you will find that the installation failed.Configure Master11. Modify the My.

1. Query cache optimization for your queryShow variables like "%query_cache%"//Check whether the cache is turned onTo open a command:Set global query_cache_type = 1;Set global query_cache_size = 600000;2.EXPLAIN your SELECT queryUse the EXPLAIN

Two redhat virtual machines with MySQL in the environment[Email protected] etc]# ifconfig-a # #记录下master的ip为192.168.88.145[Email protected] ~]# Find/-name my-medium.cnf #

1. View the status of the database server: MySQL Server Status under Linux The list mainly includes the MySQL version (for version 5.1.61), therunning platform (Debian-linux-gnu (i686)), the database connection ID, the current connected user,

1.mysqldump ( Database Backup program ) 1.1 of 3 ways to call mysqldump mysqldump [ options ] db_name [ tables mysqldump [ options " -- -database DB1 [DB2 DB3 ...] mysqldump [ options ] -- all--database If no tables are specified or if

To find the order and parameters of the configuration file:/usr/bin/mysql--help--verborse View:Default options is read from the following files in the given order:/etc/mysql/my.cnf/etc/my.cnf ~/.my.cnfSet Password:Start service: Systemctl start

Installing dependent librariesNPM install MySQLCreate a database connectionvar mysql = require (' mysql '); Define connection parameters var Mysqlconn = {host: ' 127.0.0.1 ', User: ' User ', Password: ' Password ', database: ' Nodejs ', Port: ' 3306

Master on authorization from the library:```Grant Replication Slave on * * to [e-mail protected] identified by ' password ';```Database-based Hotcopy backup script processing:```[[email protected] 20150806104509]# lsBACKUP-MY.CNF SSS ibdata1

Use SQL syntax capitalization to increase readability (the lowercase part is the table/field written by your database, you know ...).Creating a database: Create databases mysql_db;Delete databases: drop database mysql_db;View database: Show