MySQL

1. Download the installation packagewget http://cdn.mysql.com/archives/mysql-5.6/mysql-5.6.26-linux-glibc2.5-x86_64.tar.gz  2. Unpacking the installation package tar ZXVF http://cdn.mysql.com/archives/mysql-5.6/mysql-5.6.26-linux-glibc2.5-x86_64.tar.

install the MySQL steps on Ubuntu 16.04:If you are using a previous version of Ubuntu 16.04, you can look here: Ubuntu 14.04/15.10 upgrade to Ubuntu 16.04 LTS.One. Install MySQL1. Update the package list before installing:$ sudo apt update2. Install

1. Storage structureMyISAM: Each MyISAM is stored on disk as three files. The first file name begins with the name of the table, and the extension indicates the file type. frm file stores the table definition. The data file has an extension of. MYD (

What kinds of indexes does MySQL supportFrom the data structure angle1. B + Tree index (O (log (n))): for the B + Tree index, you can refer to the data structure behind the MySQL index and the algorithm principle2. Hash index:A can only satisfy "=",

When our data volume increases, the database needs to be expanded, or is highly available, then we need to use more than one MySQL server at a time.Through configuration: Can be implemented, a master MySQL, responsible for recording data changes,

Linux start-up programs are generally placed in the/etc/rc.d/init.d/,/etc/init.d/is its soft connectionMySQL Set as Linux serviceCp/usr/local/mysql5/share/mysql/mysql.server/etc/init.d/mysqldChkconfig--add mysqldChkconfig--level 2345 mysqld onChown

mysql GROUP_CONCAT 函数 将相同的键的多个单元格合并到一个单元格MemberID MemberName FruitName-------------- --------------------- --------------1 Al Apple1 Al CherryDesired outputMemberID MemberName FruitName-----------

The MySQL database engine (by default) has three:ISAMMYISAMHEAPIn addition INNODB BERKLEY (BDB) can often be usedISAM:Pros: At the beginning of the design, the reads are much larger than the number of times the data is updated, so the read operation

[email protected] ~]# Yum install ncurses-devel libaio-devel-y[[email protected] cmake-3.6.1]# tar-xf cmake-3.6.1.tar.gz[[email protected] cmake-3.6.1]# CD Cmake-3.6.1[[email Protected] cmake-3.6.1]# Gmake[[email protected] cmake-3.6.1]# gmake

The following error occurred when MySQL changed the table character set and sort method.(HY000): Error on Rename of .... (errno:150).Because of a foreign key or primary key issue in the table.You need to modify the value of Foreign_key_checks=0 to 0.

Ask too general, generate static HTML page, squid reverse proxy, apache,mysql load balancer. Can take the method of data caching, we usually at the time of the statistics, we need to calculate the original data on the basis of a series of

1. Database ("Pikachu" Here is the database name)SHOW DATABASES; # #查看数据库Use Pikachu; # #切换到数据库CREATE DATABASE Pikachu; #创建数据库DROP DATABASE Pikachu; #删除数据库2. table ("Student" here is the table name)SHOW TABLES; #查看表CREATE TABLE Student (name VARCHAR)

1.Requirements: mysql migrated from server to serveron server:Nc-l 12345|tar ZXVFto one server:Ldd/usr/local/mysql/bin/mysqld|xargs tar zcvf so.tar.gz // use ldd to view dependent library files and package SCP so.tar.gz 192.168.1.12:/root //

Town Yard text:The Confucian School of the practical and practical, line Buddhism Purdue sentient beings, the monastic Kangsheng fidelity, understanding of the easy to change the image. To science and technology to shine a good law, the achievement

Specific Installation Tutorials: Search to find the official MySQL, and then find the download page on the official website, please do not download the wrong, we look carefully Here we find this installer, click to enter Then, we

Function:1. Intercept string from leftLeft (str, length)Description: Left (truncated field, intercept length)Example: Select Left (content,200) as abstract from my_content_t2, starting from the right to intercept the stringRight (str,

Install mysql zip package version in win10 and win10mysql Download zip https://www.mysql.com/downloads/ from official website Extract D: \ devtool \ mysql-5.7.17-winx64 \   Add D: \ devtool \ mysql-5.7.17-winx64 \ bin to Environment

Install mysql in Ubuntu 16.10 and Ubuntu Open Terminal After sudo apt update is complete, The sudo apt install mysql-server will prompt you to set the password of the root account. Some Articles mentioned that it is unnecessary to install

Printf () and printfIf you want to output a mixed product composed of static text and dynamic information stored in one or more variables, the printf () Statement is no longer ideal. There are two reasons why it is ideal. First, it clearly divides

Set up MySQL in Linux and MySQL in Linux 1. before installing the mysql database server, make sure that your linux system can connect to the network. We will install mysql through the source code, first, make sure that the gcc c ++ and other