MySQL

MySQL Cluster is a technology that allows the Cluster of an "in-memory" database to be deployed in a system that is not shared. With no shared architecture, the system can use inexpensive hardware and has no special requirements for hardware and

I. INTRODUCTION of ATLASAtlas is a MySQL protocol-based data mid-tier project developed and maintained by Qihoo, a web platform infrastructure team. It was optimized on the basis of the Mysql-proxy 0.8.2 version, adding some new functional features.

MySQL floating-point and fixed-point types can be represented by the type name plus (m,d), m represents the total length of the value, D represents the length after the decimal point, and M and D are also known as precision and scale, such as float (

Http://www.cnblogs.com/pcdelphi/archive/2009/10/31/2017990.htmlactual combat experience:> Login to MySQL database terminal >show status; Results: See Threads beginning of No, threads_connected is the current number of connections other look at

Reference: http://www.cnblogs.com/xcxc/archive/2013/01/30/2882840.htmlThis article is very good, concise, and easy to read, typesetting is also very good-looking, not like online just in the page heap knowledge.MySQL Export with command line, import

CentOS installs mysql-server with Yum2012-11-09 11:25:09| Category: Linux| Report | Font size Subscription 1. Install: #yum-y Install Mysql-server2. Modify the configuration: #vi/etc/my.cnfTemporarily modify the encoding (add below password):

(GO) view creation and deletion of MySQL index1． Index functionIn addition to the ordered lookups mentioned above, the database uses a variety of fast location techniques to greatly improve the query efficiency. In particular, when the amount of

1. Install MySQL server and client#sudo apt-get Install Mysql-server mysql-client2. Start the MySQL service#sudo/etc/init.d/mysql Start3. Connect to MySQL server#mysql-U root-pOr$mysql-U bookorama-pMysql>show databases;Mysql>use Books;Mysql>show

Modifying the table engine methodMethod 1: Modify the Mysql.ini configuration file and restart the MySQL service to take effectModify the My.ini, and under [mysqld] AddDefault-storage-engine=innodbWhere the red font portion is the name of the engine

[MySQL Optimizer]--How to find the reason for SQL efficiency underground Source: Chinaunix Blog Date: 2009.07.20 16:12 (Total reviews ) I want to comment

After the MySQL client connection is successful, the show [session|global]status command can provide server state information, or you can use the Mysqladmin extended-status command on the operating system to obtain these messages.Show

Customer-side Connector serverClient------to-------connection------to----------serverCharacter_set_client: Sets the customer-side character set, such as set Character_set_client=utf8; set to UTF8 encodingCharacter_set_connection: Setting the

PackageJavase.jdbc;Importjava.sql.Connection;ImportJava.sql.DriverManager;Importjava.sql.SQLException;ImportJava.sql.ResultSet;Importjava.sql.Statement; Public classTestjdbcmysql {Private StaticConnection con =NULL; Private StaticStatement sql =NULL;

The replace operation is similar to insert. There is only one exception, if an old record in the table is used with a primaryA new record of key or a unique index has the same value, and the old record is deleted before the new record is

Understand that MySQL must firmly remember its architecture diagram, MySQL is composed of SQL interface, parser, optimizer, cache, storage engine1 connectors refers to the interaction of SQL in different languages2 Management serveices & Utilities:

#mkdir/home/mysql_servers/mysql330{7,8,9}-P#useradd-G MySQL mysql3307-s/bin/nologin-d/home/mysql_servers/mysql3307#tar XF mysql.tar.gz#cd mysql/#./configure--prefix=/home/mysql_servers/mysql3307#make#make Install#cp

First, install APACHE1, check whether Apache service is installed [ Email protected] ~]# cd/home/oldboy/tools/[ [email protected] tools]# rpm-qa httpd 2, download, unzip Apache [[ email protected] tools]# wget-q http:/

1. Modify the character encoding and modify it all to GBK. like ' %char% ' ; set character_set_database=GBK;Among them, Character_set_client is the client-side encoding method, Character_set_connection is used for establishing the connection

Maintenance triggers for URL query hash values2.1 CREATE TABLE Pseudohash.2.2 Creating triggers, triggering triggers when inserting and updating tablesDelimiter|Create TriggerPseudohash_crc_ins beforeInsert OnPseudohashForEach rowBegin Set @x

Rotten mud: Learn mysql binlog configuration, mysqlbinlog This article was sponsored by Xiuyi linfeng and first launched in the dark world. 1Basic knowledge Logs record every change in the database to a dedicated file, which is called a log file.