“Neo4j is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. A 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;
• Neo4j.rb, JRuby API;
• Lucene for quering and indexing.

Neo4j is released under a GNU Affero General Public License, so read carefully. There’s a price table for commercial products that includes severall support levels.

posted by pedro mg at 9:52 pm & filed under code |