MySQL

    MYSQL Master-slave replication principle 1 Replication Overview      mysql built-in replication capabilities are the foundation for building large, high-performance applications. The distribution of MySQL data across multiple systems is done by

Syntax: mysqldump-u user name-p password database name > backup file name1. Backup library mysqldump-uroot-p123456 mysql >/tmp/mysql.sql[Email protected] ~]# mysqldump-uroot-p123456 MySQL >/tmp/mysqlbak.sql--warning:skipping The data of table

Trigger Simple to understandTrigger (Trigger): Monitors a situation and triggers an action, which is a special stored procedure related to a table event, which is executed either by a program call or by a manual startup, but by an event, such as

MySQL mariadbClient connectionsMysql-uroot-p;Client exitExit or \qShow all databasesshow databases;Show schemas;Create a databaseCreate DATABASE DB1CharSet UTF8;Deleting a databaseDrop database db1;Drop database if exists db1;View TableShow

设置更改root密码The default Mysqlroot user's password is empty, but this is not secure, so we need to configure the security password#mysql -uroot mysq命令默认是不存在的，因为mysql安装在/usr/local/mysql/bin下，环境变量里面不存在mysql命令，需要将命令加在环境变量里面#export

1 Introduction to Storage Engine ConceptsThe storage engine is how to realize how to store the data, how to index the stored data and how to update and query the data. The storage engine in the database is actually a set of tables that use the

installation and use of MySQLDescription: MySQL is a multi-threaded, multi-user SQL database, with high performance, high reliability, easy to use and other features.Installed software Link: Https://pan.baidu.com/s/1smRLkoX Extract code: vd5vPart I:

PHP and MySQL can make simple additions and deletions to the database, this article introduces the background management of the news list.MySQL Database creationCreate a database of news lists:1. Query Database 1.1. Create file dbconfig.php, save

BasicCommands for the database:View all databases: show databases;View the currently used databases: Select database ();Switch database: use database name;Creating database: Create database name Charset=utf8;Delete the database: drop database

The level of isolation for MySQL InnoDB transactions is level four, which is "repeatable read" by default (Repeatable Read). Unread (Read UNCOMMITTED). Another transaction modifies the data but has not yet committed, and select in this

As a PHP developer, the index of MySQL is an essential issueFor example, an SQL query:SELECT * FROM Userstatic where the nick like "" and rip=3726854906;Some of the questions that may be asked are:1. If Nick is not an index and RIP is an index, will

An addressGithup AddressHttps://github.com/akopytov/sysbenchTwo versions Sysbench 1.0+Three ConceptsSysbench testnameTestName is an optional name for a built-in test (such as FILEIO,OLTP, etc.), or the name of a bound Lua script (such as

MySQL btree index and Hash index of the difference Ash index structure of the particularity, its retrieval efficiency is very high, index retrieval can be located at once, unlike the B-tree index needs from the root node to the side point, and

Check if MySQL is already installedrpm-qa| grep MySQL[Email protected]/]# Rpm-qa | grep MySQLMysql-libs-5.1.71-1.el6.x86_64Uninstall MySQLRpm-e Mysql-libs–nodepsFind out about MySQL files in your computer and delete them as much as possible, if

SQL: Called Structured Query Language, it is internally divided into: DML statements: Data manipulation language, for increment (insert), delete (delete), check (select), Change (update) DDL statement: Data definition language for data storage,

MySQL System FeaturesSystem Features1, the use of C and C + + written, and use a variety of compilers to test, to ensure the portability of the source code.2. Support for AIX, FreeBSD, HP-UX, Linux, Mac OS, Novellnetware, OpenBSD, Os/2 Wrap, Solaris,

CENTOS7 environment MySQL5.6 on-line installation methodNote: First make sure that CentOS is networked, then log in to CentOS using the root account, and install it in five steps below.The first step is to download the MySQL corresponding project

DML: statement, common Select, insert INTO, delete,updataSELECT statement : The general usage of the SELECT statement is: The Select field name from the tb_name where condition; Select query statement types are generally divided into three kinds:

OverviewAs the current production environment of the MySQL database distributed in two servers, from a single master and slave view, configuration is very simple, but need to synchronize two server database to one from the library above, need to do

Difference between utf8 and utf8mb4 in mysql I. Introduction MySQL added the utf8mb4 encoding after 5.5.3. mb4 is the meaning of most bytes 4, which is specially used to be compatible with four-byte unicode. Fortunately, utf8mb4 is the superset of