Overview
This pattern is fundamental to achieving true loose coupling in microservices. It ensures that services are independent and can be developed, deployed, and scaled without affecting each other's data.
Key Features
- Encapsulation: Data is hidden behind the service's API.
- Polyglot Persistence: Each service can use the database type best suited for its needs (e.g., SQL, NoSQL, Graph).
Challenges
- Data Consistency: Requires patterns like Saga or Event Sourcing to manage transactions across services.
- Reporting: Joining data from multiple databases becomes more complex.