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MongoDB (from "humongous") is a scalable, high-performance, open source, document-oriented database. The MongoDB package comes with a handy set of featuers, including:
Document-oriented storage
JSON-style documents with dynamic schemas offer simplicity and power.
Full Index Support
Index on any attribute, just like you're used to.
Replication & High Availability
Mirror across LANs and WANs for scale and peace of mind.
Auto-Sharding
Scale horizontally without compromising functionality.
Querying
Rich, document-based queries.
Fast In-Place Updates
Atomic modifiers for contention-free performance.
Map/Reduce
Flexible aggregation and data processing.
GridFS
Store files of any size without co mplicating your stack.
What's New in This Release: [ read full changelog ]
Bug fix:
· Seg fault when shutting down replica set member - Subscription Build with SSL Enabled
· Initial sync criteria needs to check minValid, not the oplog
Improvement:
· New replication dep. on minvalid collection causes bad behavior

Via: MongoDB 2.2.2 / 2.2.3 RC0 / 2.3.2 Development