Already one of the finest JSON-document databases out there, MongoDB has unleashed an impressive set of improvements with its 3.0 release. Originally, the release was given the numeric designation of 2.8, but after significant feedback from the user base -- whose members claimed that the extent of the new features warranted an integer-level version number change -- the MongoDB engineers rechristened the release MongoDB 3.0.
Though the new features are numerous, perhaps the most significant is the new pluggable storage engine API. Not only does this interface permit third parties to create new storage engines, tuned to specific applications, it allows MongoDB to provide its own storage engines, which are available as part of the release. Both MongoDB engines bring more granular locking and greater concurrency to the database -- in a nutshell, more speed.
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