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This paper briefly describes what NoSQL systems are and the motivating factors for their recent
interest. Core concepts associated with the NoSQL data model are introduced, compared and
differentiated with the relational model. The four major types of NoSQL systems are then
discussed, along with brief descriptions of some well known data store implementations.
Included are short descriptions of how NoSQL systems are currently helping solve some of the
business problems of big data and search. Finally, the paper concludes by mentioning some
topics and issues that lie ahead for the NoSQL movement.