Mongo is a high-performance, open source, schema-free document-oriented database. MongoDB is written in C++ and offers the following features: * Collection oriented storage: easy storage of object/JSON-style data * Dynamic queries * Full index support, including on inner objects and embedded arrays * Query profiling * Replication and fail-over support * Efficient storage of binary data including large objects * Auto-sharding for cloud-level scalability * Commercial Support Available A key goal of MongoDB is to bridge the gap between key/value stores and traditional RDBMS systems .