MySQL

Compile and install MARIADB on CENTOS7 and implement multi-instancePlease read the 7th and 8th of the preparation, and it is recommended to install both packages before compilingPreparatory work:1 iptables off; SELinux off systemctl stop

Difference:MyISAM types do not support advanced processing such as transaction processing, and InnoDB type support. The MyISAM type of table emphasizes performance, which is performed more quickly than the InnoDB type, but does not provide

Centos7 on the implementation of multi-instance installation, is a service on 3306, 3307, more than 3,308 ports running and each database, equivalent to three different programs;1 Install Package yum -y install mariadb-server2 The database is

The MySQL replication feature uses three thread implementations, one on the primary server and the other on the slave server:Binlog (binary log) dump thread. The master creates a thread that sends the binary log content to the slave when it is

1.show//view, show2.use//Selection (Library/table)3.DATABASE/S//library/All libraries4.TABLE/S//table/All Tables5.primary key//PRIMARY key: Non-repeatable, NOT NULL6.unique key//Unique key: Non-repeatable, can be empty7.primary key

This article directory:1. Create and Modify views2. View algorithm Merge, temptable3. Deleting and viewing View information4. Check for invalid viewsA view is a type of table expression, so it is also a virtual table. When you view an operation, the

Storage engines that use table-level locks in mariadb/mysql (such as MyISAM, Aria (MariaDB improvements to MyISAM engine, formerly MyISAM)) are read (select), write operations (INSERT, delete, UPDATE, Replace) has a priority concept. By default,

The database uses stored procedures to insert 10 million test data without any optimizations.CREATE PROCEDURE Addmaxdata (in n int)BEGINDECLARE i INT DEFAULT 1;START TRANSACTION;while (i INSERT into Maxdata (name,createdate) VALUES (CONCAT (' Loser

MySQL Explain execution plan detailed1), the ID column of the larger the first to execute, if the number is the same size, then proceed from the top down, the ID is listed as NULL for the table is this is a result set, do not need to use it to query.

This article JS code to take the ES6/ES7, rather than the commonjs of the wording. Support a new wave of JS syntax.Node version of MySQL driver, installed via NPM i mysql. Website address:Https://github.com/mysqljs/mysqlWe are using connection

MySQL Sub-Library sub-tablefirst, the whole way of segmentation 1, Sub -Database sub-table: that is, the segmentation of data is through a specific condition, we stored in the same database of data scattered into multiple databases (host), in order

1. First look at the data I need to import:When opened with Excel, displays:Open the display with notepad++ as:2. Use notepad++ to open change character set to UTF-83, create a table, the fields in the table to be consistent with the file3. Execute

pull library/mysql$ Docker pull Mysqlload image$ Docker load-i mysql.tarsave image$ Docker save-o ~/desktop/mysql.t AR mysqlrun$ Docker volume create--name mysql-data$ Docker run-d-P 3306:3306-v mysql-data:/var/lib/mysql-e mysql_root _password=123456

One, download the ODBC driver package: https://dev.mysql.com/downloads/connector/odbc/Download according to your computer versionAfter downloading the installation, you canSecond, configure the data source1, first, in order to open the " Start menu "

"From" http://c.biancheng.net/cpp/u/mysql_ml/Connect to MySQL DatabaseMySQL command format: mysql-h host address-u user name-P user Password1) Connect to MySQL on this computerFirst open the DOS window, then enter the directory Mysql\bin, and then

MySQL Database Build-upFirst, mount the MySQL software package in the Linux system and unzip the package into the specified directory.cd/opt/mysql-5.5.24, start preparing to install the compilation environment, install MySQL need to compile

1. The most basic paradigm of the first paradigm, the attributes of each column in the data table are single and cannot be divided!Example: Customer table (name, number, address 、......) Where the "address" column can also be subdivided into

Login/exit Basic operations1. Enter Mysql-u root-p in cmd to log in to MySQL service2. Quit, or exit; Exit3.show databases; into the library4 ues library name; Select Database example: Use MySQL;5. See what tables are in the database show tables;6.

Description: Student is the name of the table to be createdPrimary key: Primary keyNote: Comment1, create the table:CREATE TABLE Student (Sno varchar () NOT NULL primary key comment ' study number ',Sname varchar (a) NOT null comment ' student name '

The new server, first installed on Ubuntu mariadb, and later due to a lot of permissions issues, decided to install MySQL, during the uninstallation process due to not uninstalled cleanly, resulting in a lot of problems in MySQL reload process.