After reading MySQL database advanced practice (SQL xiaoxuzhu)

️ Author URI ： Xiaoxuzhu

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Preface

Brother Xu Zhu recently wrote a technical column on database , When you want to export good technical knowledge , You also need to input constantly , Give people a scoop of water , At the bottom is a bucket of water .
This book 《MySQL Database advanced actual combat 》 It's the book that brother Xu Zhu is reading recently , Share with fans .

Introduction to

《MySQL Database advanced actual combat 》 The author of is Zhao Yuqiang , Graduated from Tsinghua University majoring in computer software engineering , near 20 year IT Industry experience . I was in BEA、 Oracle 、 Motorola and other world 500 Strong company as a senior software architect or consultant . At the same time, he is also the former dean of big data College of JD University , Proper technology boss .
The title of this book will be mistaken for an advanced learning book of database , In fact, it is the technical route of learning database , Contains MySQL All aspects involved in the database , From entry to advanced , One way arrangement .
The point is the book new , The first on the one hand, ： This book is based on MySQL 8.0 Version written .mysql Download portal

These two aspects , It's the time of publication new ：2022-08-01 published , Brother Xu Zhu is lucky to be able to read this book in advance , The first people to eat crabs , One word , sweet ~
​ Interested fans , You can buy it and have a look ： 《MySQL Database advanced actual combat 》- The book

The theme

《MySQL Database advanced actual combat 》 What's so good about this book ？ focusing MySQL The database is based on MySQL 8.0 Version writing , Yes MySQL Comprehensively and deeply explain the relevant knowledge of database , And supplemented by actual combat .
At the same time, this book is also the technical route of learning database , This paper systematically introduces the hottest technical representative in the field of open source relational database MySQL, Contains MySQL All aspects involved in the database . Try to cover with a book MySQL The core content , Including the following 12 Part content .

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features

This book is suitable for MySQL Platform architects interested in database technology 、 Operation and maintenance management personnel and project developers read . Whether readers have been exposed to database technology or not , As long as you have the foundation Linux and SQL knowledge , Can quickly master through this book MySQL And improve actual combat experience .
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Content sharing

This book focuses on actual combat , How to put it? , Let me cite a practical case in the book ： How to use slow query log .

Practical cases ： How to use slow query log

Slow query log can put more than parameters long_query_time All of time SQL Statements are recorded , help DBA There are problems in personnel optimization SOL sentence .
In short , After starting the slow query log , It can be found that the query time is longer than 3 Of a second sql sentence , there 3 Second is through parameter long_query_time Configured , Customizable .
First step ：
Query whether the slow query log is enabled

mysql> show variables like 'slow_query%';

Parameter description ：
slow_query_log Slow query on state （OFF： close ;ON： Turn on ）
slow_query_log_file Slow query log storage location （ This directory needs MySQL The writable permission of the running account , Generally set as MySQL Data storage directory ）
The second step ：
long_query_time How many seconds does the query take to record （ The default is 10s)

 show variables like 'long_query_time'

The third step ：
Slow query log enable setting method
Method 1 ： Global variable Settings
take slow_query_log The global variable is set to “ON” state

set global slow_query_log='ON'; 

Set the location of the slow query log

set global slow_query_log_file='/usr/local/mysql/data/slow.log';

Set exceeding parameters long_query_time Time log

set global long_query_time=3;

Go through the Settings above , As long as the query time exceeds 3 Of a second sql Statements will be recorded in the log .DBA Or developers according to the log SQL sentence , Optimize it .

summary

Brother Xu Zhu prefers to read practical technical books , This kind of book doesn't look boring , After reading a practical case , Can get positive feedback .
That's all for this sharing , Brother Xu Zhu went to write the technical column of the database , Goodbye, everyone .