图数据库属于专业非主流数据库，但非SQL型数据库正逐步得到主流的认可，Neo Technology的开源数据库Neo4j获得1060万美元的融资就是最新的佐证。这笔资金由Fidelity Growth Partners为首的风投公司提供，这个项目也是这家风投公司的第一笔投资，此外参与融资
图数据库属于专业非主流数据库，但非SQL型数据库正逐步得到主流的认可，Neo Technology的开源数据库Neo4j获得1060万美元的融资就是最新的佐证。这笔资金由Fidelity Growth Partners为首的风投公司提供，这个项目也是这家风投公司的第一笔投资，此外参与融资的风投公司还包括种子期投资人Sunstone Capital和Conor Venture Partners。
非SQL数据库的种类很广，但是通常吸引眼球的是面向文档型数据库（如MongoDB和CouchDB）和键值型数据库（如Cassandra），因为这些数据库处理的是规模化、速度和灵活性等问题，这些都是web公司和大型公司所关注的。
但是图数据库也有自己的特色。图数据库的特长是找出不同数据之间存在的关系，其主要的应用案例就是社交图谱。图数据库能够分析TB级的图数据，与此同时还能够维护数据之间的关系，即便数据和关系不断变化也能如此。
除了Neo4j以外，图数据库产品还包括初创公司Ravel Data 的GoldenOrb，以及在非SQL领域拥有丰富经验的Objectivity公司的InfiniteGraph。不过图数据库的知名度主要是靠一些大型的网络公司打出来。谷歌有Pregel，Twitter有FlockDB。
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