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MongoDB, an word-play from "huMONGOus" is written in C++ and is scalable, high-performance, open source, document-oriented database.
It bridges the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide rich queries and deep functionality).
The downloads section contains links to the source code and the binary packages.
Here are some key features of "MongoDB":
General Features:
· Document-oriented storage - JSON-style documents with dynamic schemas offer simplicity and power.
· Full Index Support - Index on any attribute, like normal.
· 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 complicating the stack.
Drivers for:
· .NET
· C
· C#
· C++
· Clojure
· ColdFusion
· D
· Delphi
· Erlang
· Factor
· Fantom
· F#
· Go
· Groovy
· Haskell
· Java
· JavaScript
· Lua
· node.js
· Objective C
· PowerShell
· Perl
· PHP
· Python
· Ruby
· REST
· Scala
· Scheme (PLT)
· Smalltalk
What's New in This Release: [ read full changelog ]
· New Geospatial Indexes with GeoJSON and Improved Spherical Geometry.
· New Hashed Index and Sharding with a Hashed Shard Key.
· New Modular Authentication System with Support for Kerberos.
· Role Based Access Control and New Privilege Documents.
· Enhanced SSL Support.

Via: MongoDB 2.4.1






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