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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2017-06-30 21:53:47 +00:00
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pumlid: 7SPR4a0m3030gt00pR_RH6I8QQFouFgC_TfHb6gkd5Q7FQBx363ub4rYpoMTZKuDrYXqDX37HIuuyCPfPPTDfuuHREhGqBy0NUR0GNzAMYizMtq1
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2017-06-30 21:41:01 +00:00
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categories: Architectural
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tags:
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- Java
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- Difficulty-Intermediate
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---
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## Intent
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CQRS Command Query Responsibility Segregation - Seperate the query side from the command side.
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## Applicability
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Use the CQRS pattern when
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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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## Credits
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* [Greg Young - CQRS, Task Based UIs, Event Sourcing agh!](http://www.amazon.com/Effective-Java-Edition-Joshua-Bloch/dp/0321356683)
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* [Martin Fowler - CQRS](http://codebetter.com/gregyoung/2010/02/16/cqrs-task-based-uis-event-sourcing-agh/)
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* [Oliver Wolf - CQRS for Great Good](https://www.youtube.com/watch?v=Ge53swja9Dw)
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