MongoDB for flexible schemas, PostgreSQL for relational data and transactions.
MongoDB¶
- Flexible schema — schema-less
- Horizontal scaling (sharding)
- Aggregation pipeline
- Document model — JSON-like
PostgreSQL¶
- ACID transactions
- Relational model with referential integrity
- JSONB — semi-structured data in a relational DB
- Mature ecosystem, extensions
When to Use Which¶
- MongoDB — CMS, catalogs, rapid prototyping, frequently evolving schema
- PostgreSQL — financial data, e-commerce, reporting, relational data
- PostgreSQL with JSONB — often replaces MongoDB
PostgreSQL for Most Cases¶
PostgreSQL with JSONB covers most use cases. MongoDB for specific document workloads.
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