Pattern 56 / QUERY

CQRS Projection

Use this when Keeping write models clean while serving many read models.

Pressure
Keeping write models clean while serving many read models
Mechanism
Project write-side events into query-side models tailored to screens or apis
Toll
Projection drift, replay cost, and schema evolution need careful operations
Architecture plate56
Diagram for CQRS Projection
Executive brief

CQRS Projection fits when Keeping write models clean while serving many read models. Mechanism: Project write-side events into query-side models tailored to screens or APIs. Use it for Event-sourced systems and high-read domains. The toll: Projection drift, replay cost, and schema evolution need careful operations.

Use when

Event-sourced systems and high-read domains.

Example

Use cqrs projection when event-sourced systems and high-read domains..

Review framing

Describe the pressure first, then the mechanism, then the cost. That keeps the design grounded.

Same pressure family

Data / Query

55Materialized View
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