Event-Driven Architecture · question
Q.04 of 34
Explain the difference between CQRS and traditional CRUD operations.
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Re-explain
CRUD (Create, Read, Update, Delete):
- Single model for all operations
- Direct database manipulation
- Immediate consistency
- Simple but can become complex as system grows
CQRS:
- Separate models for commands and queries
- Commands change state through business logic
- Queries read from optimized projections
- Eventual consistency between command and query sides
Comparison:
| Aspect |
CRUD |
CQRS |
| Models |
Single model |
Separate command/query models |
| Complexity |
Lower initially |
Higher initially |
| Scalability |
Limited |
High |
| Consistency |
Strong |
Eventual |
| Performance |
May degrade |
Optimized for each use case |
| Flexibility |
Limited |
High |
When to use CQRS:
- Complex business logic
- Different read/write performance requirements
- Multiple views of same data needed
- High-scale applications
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