2017-06-30 21:41:01 +00:00
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---
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layout: pattern
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title: CQRS
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folder: cqrs
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permalink: /patterns/cqrs/
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categories: Architectural
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2021-05-19 10:49:05 -06:00
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language: en
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2017-06-30 21:41:01 +00:00
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tags:
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2020-07-26 11:30:42 +03:00
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- Performance
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- Cloud distributed
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2017-06-30 21:41:01 +00:00
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---
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## Intent
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2017-07-29 12:04:04 +01:00
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CQRS Command Query Responsibility Segregation - Separate the query side from the command side.
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2017-06-30 21:41:01 +00:00
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2019-12-07 20:01:13 +02:00
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## Class diagram
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2017-06-30 21:41:01 +00:00
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## Applicability
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Use the CQRS pattern when
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2020-07-26 11:30:42 +03:00
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* You want to scale the queries and commands independently.
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* You want to use different data models for queries and commands. Useful when dealing with complex domains.
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* You want to use architectures like event sourcing or task based UI.
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2017-06-30 21:41:01 +00:00
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## Credits
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2017-07-29 12:04:04 +01:00
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* [Greg Young - CQRS, Task Based UIs, Event Sourcing agh!](http://codebetter.com/gregyoung/2010/02/16/cqrs-task-based-uis-event-sourcing-agh/)
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* [Martin Fowler - CQRS](https://martinfowler.com/bliki/CQRS.html)
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2017-06-30 21:41:01 +00:00
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* [Oliver Wolf - CQRS for Great Good](https://www.youtube.com/watch?v=Ge53swja9Dw)
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2020-07-26 11:30:42 +03:00
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* [Command and Query Responsibility Segregation (CQRS) pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs)
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