Neo Launches Open Source NoSQL Graph Database

"In Eifrem's view, there are only four types of NoSQL databases: key value stores, BigTable types like Apache Cassandra, document databases like CouchDB and MongoDB, and the fourth is Graph databases like Neo4j.

"In the graph data model, there are nodes with type relationships across nodes," Eifrem said.

Eifrem said a graph database can then attach key value pairs to nodes and their relationship. He noted that the way nodes are connected is a first-class citizen in the graph data model.

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