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Neo4j Internals

DZone's Guide to

Neo4j Internals

· Java Zone
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Learn how our document data model can map directly to how you program your app, and native database features like secondary indexes, geospatial and text search give you full access to your data. Brought to you in partnership with MongoDB.

An overview of Neo4j Internals
View more presentations from Tobias Lindaaker

It is interesting to see how node, relationship and property records are stored differently on disk and in the cache.

It is all linked lists of fixed size records on disk. Properties are stored as a linked list of property records, each holding a key and value and pointing to the next property. Each node and relationship references its first property record. The Nodes also reference the first relationship in its relationship chain. Each Relationship references its start and end node. It also references the previous and next relationship record for the start and end node respectively.

On disk most of the information is contained in the relationship records, with the nodes just referencing their first relationship. In the Node cache this is turned around: the nodes hold references to all of its relationships. The relationships are simple, only holding its properties. The relationships for each node is grouped by RelationshipType to allow fast traversal of a specific type. All references (dotted arrows) are by ID, and traversals do indirect lookup through the cache.

View a video presentation of these slides on Skill Matter.

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Published at DZone with permission of Max De Marzi, DZone MVB. See the original article here.

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