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Vansh Khandelwal

Full Stack Web Devel... • 14h

CQRS with event sourcing separates commands (state-changing) from queries (reads), enabling independent scaling and optimized models. CQRS offers scalability, simplified domain logic and performance via tailored stores; event sourcing persists state changes as immutable events, delivering a complete audit trail, the ability to rebuild state by replaying events, and decoupled async reactions. Combined, they use event-backed write models and denormalized read views, accept eventual consistency, simplify testing via event replay, and improve resilience. Best practices: start small, implement event versioning, monitor read/write performance, use projections and snapshots for efficiency. A financial example: record transactions as events for history and reconstruction. Adopt CQRS+ES when auditability, scalability, and complex domain rules justify extra complexity.

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