Neo4j

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Neo4j
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Developer(s) Neo Technology
Initial release 2007 (2007)
Stable release 2.3.0 / October 21, 2015; 8 years ago (2015-10-21)
Written in Java
Operating system Cross-platform
Type Graph database
License Dual-licensed: GPLv3 and AGPLv3 / commercial
Website neo4j.com

Neo4j is an open-source graph database implemented in Java and accessible from software written in other languages using the Cypher Query Language through a transactional HTTP endpoint.[1][2][3] The developers describe Neo4j as an ACID-compliant transactional database with native graph storage and processing.[4] Neo4j is the most popular graph database.[5]

Neo4j version 1.0 was released in February, 2010.[6] The community edition of the database is licensed under the free GNU General Public License (GPL) v3. The additional modules, such as online backup and high availability, are licensed under the free Affero General Public License (AGPL) v3. The database, with the additional modules, is also available under a commercial license, in a dual license model.[7]

Neo4j version 2.0 was released in December, 2013.[8]

Neo4j is developed by Neo Technology, Inc., based in the San Francisco Bay Area, US and Malmö, Sweden.

Licensing and editions

Neo4j comes in 3 editions: Community, Enterprise, and Government. It is dual-licensed: GPLv3 and AGPLv3 / commercial. The Community Edition is free but is limited to running on 1 node only due to the lack of clustering and is without hot backups.[9] The Enterprise Edition (which requires buying a license unless the application built on top of it is open-sourced) unlocks these limitations allowing for clustering, hot backups and monitoring. The Government Edition extends the Enterprise Edition adding additional government specific services including FISMA related certification and accreditation support.

Data structure

In Neo4j, everything is stored in form of either an edge, a node or an attribute. Each node and edge can have any number of attributes. Both the nodes and edges can be labelled. Labels can be used to narrow searches. As of version 2.0, indexing was added to Cypher with the introduction of schemas.[10] Previously, indexes were supported separately from Cypher.[11]

People

The Neo Technology board of directors consists of Rod Johnson (founder of the Spring Framework), Chris Barchak (Partner at Conor Venture Partners), Magnus Christerson (Vice President of Intentional Software Corp), Nikolaj Nyholm (Partner at Sunstone Capital), Guarav Tuli (Principal at Fidelity Growth Partners) and Johan Svensson (CTO of Neo Technology).[12]

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  • Neo4J in action Neo4j in Action released in Paperback – 21 Dec 2014
  • [1] Neo4j Editions on official website

External links


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