Software Engineering Radio - the podcast for professional software developers

Episode 218: Udi Dahan on CQRS (Command Query Responsibility Segregation)

Jan 30, 2015

01:02:28

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Udi Dahan discusses the CQRS architectural pattern, its relation to the command pattern, event ordering, event sourcing, and its popularity in different programming communities. He also provides resources for learning more about CQRS.

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Episode notes

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Quick takeaways

CQRS is a valuable architectural pattern for domains with complex business logic, allowing for separate handling of queries and commands and improving scalability and performance.

CQRS can be applied to both relational and NoSQL databases, with the choice of data persistence aligning with the specific requirements and complexities of the domain.

Deep dives

CQRS and its Background

CQRS (Command Query Responsibility Segregation) was coined by Udi Dehaan and Greg Young as a solution to the problem of using the same set of objects for commands and queries. They found that using different sets of objects worked better, leading to the development of CQRS. CQRS is primarily suited for domains with complex business logic and tasks, rather than simple CRUD operations.

Introduction

2min

CQRS and the Command Pattern

28min

Exploring Event Ordering in CQRS and the Importance of Domain Expert Consultation

6min

Event Sourcing and CQRS Connection

18min

The Popularity and Adoption of CQRS in Different Programming Communities

3min

Resources and Recommendations for Learning about CQRS

4min

Wrapping Up and Providing Ways to Connect

2min

Guest Udi Dahan talks with host Robert Blumen about the CQRS (command query responsibility segregation) architectural pattern. The discussion begins with a review of the command pattern. Then a high-level overview of CQRS, which consists of a separation of a command processing subsystem that updates a write model from one or more distinct and separate, […]

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