# CQRS

CEFR C2 · Noun

Source: https://englishreference.com/word/cqrs
Updated: 2026-07-22

## Definition

Stands for Command Query Responsibility Segregation. A way of building computer programs where the part that changes data is kept separate from the part that reads data.

For teachers: Abbreviation for Command Query Responsibility Segregation. An architectural pattern that separates the models for reading and writing data, allowing each to be optimised independently for performance and scalability.

## Examples

- The team used CQRS to handle the high volume of user requests.
- By implementing CQRS, the developers could scale the read database separately from the write database to improve system speed.
- While CQRS adds significant architectural complexity, it is often necessary in distributed systems where high availability and complex business logic require distinct data models for updates and queries.

## Usage notes

- Commonly used in the context of microservices and domain-driven design.

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