Understanding the internals of Neo4j

Having a good understanding of how Neo4j stores data can help us to build better queries. There are a few files that are important to understand how Neo4j stores data.

They are given in the following list:

• nodestore.db: This is the file that stores all the nodes. The internal node ID is indexed in this file.
• relationshipstore.db: This is the file that stores all the relationships. The internal relationship ID is indexed in this file.
• propertystore.db: This is the file that stores all the properties, whether they are on a node or relationship. This file does not store the large string values or array values, as they may not fit into the property record.
• propertystore.db.strings: This file stores the large string values.
• propertystore.db.arrays: This file stores the array property values.
• Schema: This directory stores the indexes.

Let’s take a look at these store sizes for a database.

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