MongoDB
MongoDB is a document database storing flexible JSON-like records, designed for horizontal scaling through built-in sharding and replica sets. Its query API maps naturally to objects in application code.
Pros
- Flexible schema. Documents evolve without migrations, speeding early product iteration. 0
- Built-in sharding. Horizontal write scaling is a first-class, supported feature. 0
- Developer ergonomics. JSON documents map directly to application objects. 0
- Atlas managed service. The official cloud handles backups, scaling, and search. 0
Cons
- Join limitations. Relational queries need $lookup stages that strain performance. 0
- Schema drift risk. Flexibility without discipline produces inconsistent documents. 0
- Memory hungry. The working set must fit in RAM for good performance. 0
- SSPL license. The non-OSI license restricts offering MongoDB as a service. 0
- Transaction overhead. Multi-document transactions cost noticeably more than single-document writes. 0