MySQL high performance optimization notes (including 578 pages of notes PDF document), collected

MySQL Of ⼀ Some basic knowledge

Background introduction

We visit all kinds of things every day ⽹ standing 、APP, Such as WeChat 、QQ、 Shaking, ⾳、 today ⽇ headlines 、 Tencent News, etc , On these things ⾯ All exist ⼤ The amount of information , All this information needs to be available ⽅ Storage , Where is it stored ？ database .
So if we need to develop ⼀ individual ⽹ standing 、app, Database technology that we have to master , often ⽤ Our database has mysql、oracle、sqlserver、db2 etc. .
On ⾯ To introduce the ⼏ A database ,oracle Performance ranked No ⼀, The service is quite up to standard , But the charge is also ⾮ often ⾼ Of ,⾦ Financial company's requirements for database stability ⽐ a ⾼,⼀ They will choose oracle.
mysql It's free. , other ⼏ individual ⽬ It was charged temporarily before ,mysql On the Internet ⽹ The company makes ⽤ The rate is also ranked No ⼀, Information also ⾮ Always perfect , The community, too ⾮ Often active , So we mainly study mysql. One click access to 578 page Mysql Note files

Introduction to basic knowledge of database

DB： database , A container for storing data .
DBMS： Database management system , Also known as database software or database products ,⽤ To create or manage DB.
SQL： Structured query ⾔,⽤ In the language of communication with the database ⾔, Not owned by some database software ,⽽ yes ⼏ All of the mainstream database software ⽤ The language of ⾔. China ⼈ We need to speak Chinese , And the U.S. ⼈ Communication needs to be in English , Communicating with the database needs to say SQL language ⾔.

mysql Installation

mysql often ⽤ Of ⼀ Some commands are introduced

SQL classification

One click access to 578 page Mysql Note files
It mainly includes the following five ⼤ class ：

• Integer types ：bit、bool、tinyint、smallint、mediumint、int、bigint
• Floating point type ：float、double、decimal
• String type ：char、varchar、tinyblob、blob、mediumblob、longblob、tinytext、text、mediumtext、longtext
• ⽇ Period type ：Date、DateTime、TimeStamp、Time、Year
• Other data types ： Don't introduce ,⽤ Of ⽐ Less .

MySQL Introduction to data types in

primary coverage

MySQL Data type of

Integer types

Floating point type （ Easily confused , Look for the ）

MySQL Administrator often ⽤ Of ⼀ Some orders

Introduce Mysql jurisdiction ⼯ How it works

View all ⽤ Household

establish ⽤ Household

Change Password

to ⽤ User authorization

see ⽤ User permissions

revoke ⽤ User permissions

Delete ⽤ Household

Statement of authorization principle

DDL often ⻅ Operation summary

Library management

The management of the table

Management listed in the table

Mysql series ⽬ record

DML often ⻅ operation

Environmental Science ： mysql5.7.25,cmd Enter... In the command ⾏ Play ⽰. DML(Data Manipulation Language) Data manipulation language ⾔, With INSERT、UPDATE、DELETE The three instructions are cores ⼼, Respectively stands for inserting ⼊、 Update and delete , It's a command that must be mastered ,DML and SQL Medium select Familiar scale CRUD（ Additions and deletions ）.

insert ⼊ operation

Data update

Delete data operation

select Check the basic chapter

Basic grammar

Query constants

Query expression

Query function

Query the specified fields

Query all columns

Column alias

Table alias

summary

Mysql series ⽬ record

select Conditions of the query

Conditions of the query

grammar ：
select Name from Table name where Column operator value
explain ：
Pay attention to keywords where,where after ⾯ keep pace with ⼀ One or more conditions , The condition is right ⾯ Data filtering , Only full ⾜where after ⾯ Conditional data will be returned . Next ⾯ Introduce common query operators .

Conditional query operators

be equal to （=）
select Name from Table name where Column = value ;
explain ：
Find out the records that the specified column is equal to the corresponding value .

If the value is of string type , need ⽤ Single or double quotation marks .
⽰ example ：

Logical query operators

IS NULL/IS NOT NULL（NULL Special duty ⽤ Inquire about ）

Sorting and sorting ⻚（order by 、limit）

limit Introduce

Avoid trampling

Group query （group by、having）

mysql often ⽤ Function summary

deep ⼊ Understand the connection query and its principle

Internal connection

⼦ Inquire about （ This article ⾮ Always important ,⾼⼿ necessary ）

Elaborate NULL The pit of God , Give Way ⼈ impossible to guard against

Business details

View

Variable

stored procedure &⾃ Define function details

Introduction to flow control statements

Cursor details

Exception capture and handling details

What is index ？

MySQL Detailed explanation of index principle

MySQL Index management

How to make ⽤ Indexes ？

sql Medium where Conditions are extracted and corresponding in the database ⽤ elementary analysis

Talk about how to make ⽤MySQL Implement distributed locks

MySQL How to ensure that data is not lost ？ Yes ⼏ We can learn from

Mysql series ⽬ record

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