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Neo4j.rb is a JRuby wrapper for the [Neo4j[http://neo4j.org]] graph database.

Why ?

• Whiteboard friendly – you use the language of graph (node, properties and relationship) to describe your domain as you already do on the whiteboard.
• Schema Less and Efficient storage of Semi Structured Information
• No O/R mismatch – very natural to map a graph to an Object Oriented language like Ruby.
• Performance
• Embedded Database – no database tier, easier to install, test, deploy and configure. It is run in the same process as your application.
• Express Queries as Traversals or Cypher DSL
• Fast deep traversal instead of slow SQL queries that span many table joins.
• Very natural to express graph related problem with traversals (recommendation engine, find shortest parth etc..)
• Seamless integration with Ruby on Rails.
• ACID Transaction with rollbacks support.