Book Image

Redis Stack for Application Modernization

By : Luigi Fugaro, Mirko Ortensi
1 (1)
Book Image

Redis Stack for Application Modernization

1 (1)
By: Luigi Fugaro, Mirko Ortensi

Overview of this book

In modern applications, efficiency in both operational and analytical aspects is paramount, demanding predictable performance across varied workloads. This book introduces you to Redis Stack, an extension of Redis and guides you through its broad data modeling capabilities. With practical examples of real-time queries and searches, you’ll explore Redis Stack’s new approach to providing a rich data modeling experience all within the same database server. You’ll learn how to model and search your data in the JSON and hash data types and work with features such as vector similarity search, which adds semantic search capabilities to your applications to search for similar texts, images, or audio files. The book also shows you how to use the probabilistic Bloom filters to efficiently resolve recurrent big data problems. As you uncover the strengths of Redis Stack as a data platform, you’ll explore use cases for managing database events and leveraging introduce stream processing features. Finally, you’ll see how Redis Stack seamlessly integrates into microservices architectures, completing the picture. By the end of this book, you’ll be equipped with best practices for administering and managing the server, ensuring scalability, high availability, data integrity, stored functions, and more.
Table of Contents (18 chapters)
1
Part 1: Introduction to Redis Stack
6
Part 2: Data Modeling
11
Part 3: From Development to Production

Triggers and functions

The latest addition to Redis Stack is the capacity to respond to specific events happening in your Redis database and define business logic that executes the desired actions. These events can be triggered by changes to the data, such as adding a new key-value pair. When an event occurs, the specified JavaScript function is automatically executed. However, this is not the only way to execute the desired functions: Redis Stack supports two types of triggers for execution while supporting manual user execution. For a summary, see the following:

  • User functions: Functions can be executed manually, using the TFCALL or TFCALLASYNC command
  • Keyspace triggers: These triggers are activated when there are changes to the data stored in Redis, and they execute the desired function
  • Stream triggers: Whenever new items are added to a Stream, these triggers are activated and execute the desired function

The advantage of using triggers is that you can keep...