MySQL

First check that the system has no MySQL installed[Email Protected]_167_102_centos ~]# rpm-qa| grepResults found no, then we first download the MySQL RPM packageFirst download the server[[Email Protected]_167_102_centos

#mysql查看连接数SHOW VARIABLES like '%max_connections% ';# max_connections Maximum number of connectionsSHOW VARIABLES like '%connection% ';# processlist;# to judge by observing SQL.SHOW Full ProcesslistSHOW processlist;SHOW STATUS;SHOW processlist#show

BEGINDECLARE Cflag bit DEFAULT 0;DECLARE CID int;DECLARE CNAME VARCHAR (16);--Declaring a cursorDeclare cur_copy CURSOR for select id,name from fruit;--Set cursor end tagDECLARE CONTINUE HANDLER for not found set cflag=1;--Open cursorOPEN cur_copy;--

Definition and usageThe Curdate () function returns the current date.GrammarCurdate ()Example 1Here is the SELECT statement:SELECT now (), Curdate (), Curtime ()The results are similar: Now () curdate () curtime ()

1. DownloadInstall package mysql-noinstall-5.1. -winx64.zip2. Unzip the ZIP packageInstallation path C:\Program files\mysql\mysql-5.1. -winx643. Configure Environment variablesAdd path Path C:\Program files\mysql\mysql-5.1. -winx64\bin4.

1. Establish operating system users and groups[[email protected] ~]# Groupadd MySQL[[email protected] ~]# useradd-g MySQL MySQL2. Unzip the installation file[Email protected] ~]# cd/usr/local/[[email protected] local]# mkdir MySQL[Email protected]

1, the MySQL official website downloads the Mysql-5.5.53-winx64.msi file and saves to the disk corresponding directory.2. Graphical installation of MySQL database:1) Double click Mysql-5.5.53-winx64.msi, the Welcome screen appears, default, Next:2)

Physically, the InnoDB table consists of a shared tablespace, a log file group (redo filegroup), and a table structure definition file. If Innodb_file_per_table is set to ON, a TABLE_NAME.IBD file is generated for each table, in which data, indexes,

first, the basic knowledge of InnoDB log· InnoDB log as the name implies: the InnoDB storage engine generated by the log, also known as the Redo log file, by default there are two files Ib_logfile0 and ib_logfile1 below the Innodb_data_home_dir. In

PrefaceIn the database is a sheet of inextricably linked tables, so the table design is good or bad, will directly affect the entire database. While designing the table, we will focus on one issue and what storage engine to use. Wait a minute,

User management mainly has the following functions:1. You can restrict which libraries a user accesses, which tables2. You can restrict which tables the user performs for select, CREATE, delete, delete, alter, etc.3. The IP or domain name that can

1. Establish operating system users and groups[[email protected] ~]# Groupadd MySQL[[email protected] ~]# useradd-g MySQL MySQL2, unzip the installation files, into the decompression directory:[Email protected] mnt]# TAR-ZXVF

Learning basic SQL statements, and basic MySQL operation, learn to use PHP to operate MySQL, installed PHP and Apache, summed up the problem encountered, the first download of the number of bits must be the same, because before looking at 64-bit can

[Client]# content in this directory is commonly used for localhost login, generally do not need to modifyPort = 3306# Port numberSocket =/var/lib/mysql/mysql.sock# socket file (localhost login will be generated automatically)[MySQL]# contains some

In addition to operating MySQL in the terminal, you can also operate MySQL in PHP files, the steps are as follows:1. Linked database: Mysqli_connect (Host,user[,password]);host generally write localhost or 127.0.0.1user is root have a password to

MySQL Cache Optimization and mysql Cache Optimization I'm glad to have a blogger mark my article. After I know mark, I will seldom continue to pay attention to it. However, it is explained from the perspective that when a blogger opens a blog, he

How to configure multi-thread master-slave replication in Mysql 5.7 slave node, mysql5.7 Preface Mysql multi-threaded replication is supported since Mysql 5.6. However, Mysql 5.6 has some drawbacks. Although multi-threaded replication is supported,

MySQL disables foreign key constraints of sub-tables. mysql disables foreign key constraints. Preparation: Define a instructor table and a student table. reference the instructor table ID in the student table. Create table teachers (teacherID int

Backup and restoration of a single mysql table and a single mysql table A. Install MySQL backup tool xtrabackup 1. percona official xtrabackup binary version; decompress the binary version to use it. 2. Decompress xtrabackup and create a connection.

Install Mysql 5.7.17 text tutorial in win10 system, win105.7.17 The operating system win10 MySQL is the 64-bit zip decompression Community version downloaded from the official website. Because you want to install Mysql on the company computer, so to