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Combining the best features of document databases, key-value stores, and RDBMSes.

MongoDB (from "humongous") is a scalable, high-performance, open source, schema-free, document-oriented database. Written in C++, MongoDB features:

Document-oriented storage (the simplicity and power of JSON-like data schemas)
Dynamic queries
Full index support, extending to inner-objects and embedded arrays
Query profiling
Fast, in-place updates
Efficient storage of binary data large objects (e.g. photos and videos)
Replication and fail-over support
Auto-sharding for cloud-level scalability
MapReduce for complex aggregation
Commercial Support, Hosting, and Consulting

MongoDB bridges the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide structured schemas and powerful queries).

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Combining the best features of document databases, key-value stores, and RDBMSes.

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