🍃 MongoDB Microservices Architecture
Database-per-Service Pattern: Each microservice owns its MongoDB database with complete schema autonomy, enabling independent evolution and scaling.
- Service Autonomy: Each service owns and controls its data model
- Schema Freedom: Independent schema evolution without migrations
- Built-in Scaling: Native sharding and replication per service
- Fault Isolation: Database failures don't cascade across services
- Flexible Data: Each service can store different document structures
Service Independence
True service autonomy with minimal dependencies
🐘 PostgreSQL Microservices Architecture
Relational Service Boundaries: PostgreSQL microservices require careful schema coordination, migration planning, and often shared database patterns for complex relationships.
- ACID Guarantees: Strong consistency within service boundaries
- SQL Standards: Familiar query language across services
- Referential Integrity: Foreign key constraints within services
- Mature Tooling: Rich ecosystem for monitoring and management
- Transaction Safety: Reliable cross-table operations
User Service
PostgreSQL DB
users, profiles tables
Order Service
PostgreSQL DB
orders, items tables
Cross-Service Challenges
Schema Migrations
Shared References
Join Dependencies
Coordination required for schema changes across services
Schema Coordination
Requires careful planning for service interactions
