Graph_database

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A graph database uses graph structures with nodes, edges, and properties to represent and store data. By definition, a graph database is any storage system that provides index-free adjacency.

Graph database

http://en.wikipedia.org/wiki/Graph_database
http://www.objectivity.com/infinitegraph

InfiniteGraph: The Distributed Graph Database for the Cloud and Beyond

InfiniteGraph enables organizations to achieve greater return on their data related investment by helping them “connect the dots” on a global scale, ask deeper and more complex questions, across new or existing data stores.