Neo4j A free and open source graph database
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graph database java database graph database Java persistence engine java persistence

Neo4j Description

A free and open source graph database Neo4j 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.You can think of Neo4j as a high-performance graph engine with all the features of a mature and robust database. The programmer works with an object-oriented, flexible network structure rather than with strict and static tables — yet enjoys all the benefits of a fully transactional, enterprise-strength database.In addition, Neo4j includes the usual database features: ACID transactions, concurrency control, transaction recovery, durable persistence, and everything else you would expect from an enterprise-strength database. Here are some key features of "Neo4j": · an intuitive graph-oriented model for data representation. Instead of static and rigid tables, rows and columns, you work with a flexible graph network consisting of nodes, relationships and properties. · a disk-based, native storage manager completely optimized for storing graph structures for maximum performance and scalability. · massive scalability. Neo4j can handle graphs of several billion nodes/relationships/properties on a single machine and can be sharded to scale out across multiple machines. · a powerful traversal framework for high-speed traversals in the node space. · a small footprint. Neo4j is a single What's New in This Release: · Enhancements, new features and major changes · Core: Read-only mode. It is now possible to start multiple read only · NeoServices to the same store (using EmbeddedReadOnlyNeo). · Core: Improved depth first traversal speed on nodes with many · relationships by loading relationships on demand. This will also · reduce the stress on GC when traversing over a node with many · relationships since much fewer objects will be created. · Minor enhancements, changes and tweaks · Core: Faster rebuild of id generators after a crash · Core: Exception cleanup removing bad code either catching Throwable or · throwing RuntimeException. · core: Fixed so a read only NeoService can apply a logical log from a · backup. · Bug Fixes · Fixed a bug when using plain buffers instead of memory mapped ones that · could case recovery to fail due to buffers not being flushed properly.

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