Book Image

Redis 4.x Cookbook

Book Image

Redis 4.x Cookbook

Overview of this book

Redis is considered the world's most popular key-value store database. Its versatility and the wide variety of use cases it enables have made it a popular choice of database for many enterprises. Based on the latest version of Redis, this book provides both step-by-step recipes and relevant the background information required to utilize its features to the fullest. It covers everything from a basic understanding of Redis data types to advanced aspects of Redis high availability, clustering, administration, and troubleshooting. This book will be your great companion to master all aspects of Redis. The book starts off by installing and configuring Redis for you to get started with ease. Moving on, all the data types and features of Redis are introduced in detail. Next, you will learn how to develop applications with Redis in Java, Python, and the Spring Boot web framework. You will also learn replication tasks, which will help you to troubleshoot replication issues. Furthermore, you will learn the steps that need to be undertaken to ensure high availability on your cluster and during production deployment. Toward the end of the book, you will learn the topmost tasks that will help you to troubleshoot your ecosystem efficiently, along with extending Redis by using different modules.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Windows Environment Setup

Exploring AOF

In the previous recipe, we learned how to set up AOF persistence in Redis. In this recipe, we are going to take a look at the content of the AOF file and explain the AOF rewrite process.

Getting ready…

You need to finish the installation of the Redis Server, as we described in the Downloading and installing Redis recipe in Chapter 1Getting Started with Redis.

For the purpose of demonstration, we need to disable AOF and flush all the data with the FLUSHALL command first.

How to do it...

The steps for exploring AOF are as follows:

  1. Enable AOF persistence:> CONFIG SET appendonly yes 
  1. Since there is no data in Redis, we should have an empty AOF file:
$ ls -l 
-rw-rw---- 1 redis redis   0 Oct 23 20:47 appendonly.aof
  1. Run the following commands in redis-cli:> SET k1 v1 
OK> INCR counter 
(integer) 1> INCR counter 
(integer) 2> SET k2 v2 
OK> DEL k1 
(integer) 1