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senior

What is CQRS and when should it be used?

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seniorpatterns

Command Query Responsibility Segregation — separating read and write models.

CQRS splits the system into Command (write) and Query (read) sides with different data models. The write model is optimized for consistency (normalized DB). The read model is optimized for performance (denormalized, materialized views). Synchronization happens through events. Often used with Event Sourcing.

Когда да

Read/write ratio > 10:1, different requirements for read and write models

Когда нет

Simple CRUD, small applications (overhead is not justified)

Совет на собеседовании

CQRS is not for everyone. Apply it only when there's a clear need

Альт:Simple CRUDRead replicas

Свайп вправо — знаю, влево — не знаю

ArchCase

ArchCase

Паттерны

Command Query Responsibility Segregation — separating read and write models.