Book Image

MySQL 8 Cookbook

By : Karthik Appigatla
Book Image

MySQL 8 Cookbook

By: Karthik Appigatla

Overview of this book

MySQL is one of the most popular and widely used relational databases in the World today. The recently released MySQL 8 version promises to be better and more efficient than ever before. This book contains everything you need to know to be the go-to person in your organization when it comes to MySQL. Starting with a quick installation and configuration of your MySQL instance, the book quickly jumps into the querying aspects of MySQL. It shows you the newest improvements in MySQL 8 and gives you hands-on experience in managing high-transaction and real-time datasets. If you've already worked with MySQL before and are looking to migrate your application to MySQL 8, this book will also show you how to do that. The book also contains recipes on efficient MySQL administration, with tips on effective user management, data recovery, security, database monitoring, performance tuning, troubleshooting, and more. With quick solutions to common and not-so-common problems you might encounter while working with MySQL 8, the book contains practical tips and tricks to give you the edge over others in designing, developing, and administering your database effectively.
Table of Contents (20 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Using resource groups


You can restrict the queries to use only a certain number of system resources using the resource groups. Currently, only CPU time is a manageable resource represented by virtual CPU (VCPU), which includes CPU cores, hyperthreads, hardware threads, and more. You can create a resource group and assign the VCPUs to it. Apart from the CPU, the attribute to the resource group is thread priority.

You can assign a resource group to a thread, set the default resource group at the session level, or pass the resource group as an optimizer hint. For example, you want to run some queries (say, reporting queries) with lowest priority; you can assign them to a resource group that has minimum resources.

How to do it...

  1. Set the CAP_SYS_NICE capability to mysqld:
shell> ps aux | grep mysqld | grep -v grep
mysql     5238  0.0 28.1 1253368 488472 ?      Sl   Nov19   4:04 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

shell> sudo setcap cap_sys_nice+ep /usr/sbin...