<aside> 📚 📁 Category: Architecture

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Overview

CQRS (Command Query Responsibility Segregation) separates read and write operations into different models, enabling independent optimization and scaling of each side.

<aside> ℹ️ Why It Matters: Understanding CQRS Pattern is essential for building robust, scalable, and secure modern applications.

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Key Concepts

• [x] Command Model - Handles writes
• [x] Query Model - Handles reads
• [x] Event Sourcing - Often combined with CQRS
• [x] Eventual Consistency - Between models
• [x] Separate Databases - For read/write
• [x] Command Handlers - Process commands
• [x] Query Handlers - Process queries
• [x] Projections - Build read models

Common Use Cases

<aside> 💡 Where to Apply CQRS Pattern

                        High read/write ratio applications
                        Complex reporting requirements
                        Event-sourced systems
                        Different read/write patterns
                        Scalable microservices
                        Real-time analytics

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Best Practices

• [x] Use CQRS only when needed
• [x] Version events properly
• [x] Design clear command intent
• [x] Optimize read models for queries