Аннотация

MySQL performance tuning is a very large subject that takes years to master. The length of this book bears testimony to that, even with the scope reduced to focus on query- related topics. There are no simple recipes for improving performance, and often a solution requires understanding the relationship between various parts not only within MySQL but also for other parts of the stack. If you feel that it is overwhelming to get started, you are far from the first one, but do not despair as it is with performance tuning like with other skills that practice makes perfect.
The aim of this book is to help you to get a good start on the journey to become skilled at improving the performance of the queries executing on your MySQL instances.
As said, there are no simple recipes, so the best way forward is to learn how the various components involved in performance tuning work. That is what the bulk of this book tries to do as well as giving examples of what to look for and how to perform common tasks. On the other hand, the scope has been limited to MySQL itself, so there is very limited discussion about the operating system, file system, and hardware levels.
MySQL is famous for its support for storage engines. However, this book exclusively covers the InnoDB storage engine except for the discussion of internal temporary tables.
With respect to MySQL versions, only MySQL 8 is considered. That said, most of the discussion also applies to older versions of MySQL, and in general it is mentioned when a feature is new in MySQL 8 or that MySQL 8 has a different behavior compared to older versions.