Graph Database Neo4j

August 21, 2009 by pedro mota

[Neo4j](“http://neo4j.org" “Neo4j”) is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs” “Graph”) rather than in tables. A [graph](“http://en.wikipedia.org/wiki/Graph_theory" “Graph”) (mathematical lingo for a network) is a flexible data structure that allows a more agile and rapid style of development. From the site:

  • graph-oriented model for flexible data representation;
  • graph network consisting of nodes, relationships and properties;
  • highly scalable to bilions of nodes/rels/props;
  • can be sharded to scale out across multiple machines;
  • hi-speed traversals in the node space;
  • small footprint (500k jar)
  • ACID transactions;
  • robust persistence;
  • concurrency control;
  • [API](“http://api.neo4j.org/current/" “Neo4j”);
  • [Neo4j.rb](“http://neo4j.rubyforge.org/" “Neo4j.rb”), JRuby API;
  • [Lucene](“http://lucene.apache.org/java/docs/index.html" “Lucene”) for quering and indexing.

Neo4j is released under a [GNU Affero General Public License](“http://www.fsf.org/licensing/licenses/agpl-3.0.html"), so read carefully. There’s a price table for commercial products that includes severall support levels.

© 2018 | Follow on Twitter | pedro mg & Hugo