Data Model

Indexes

GraphDB supports indexes that are implemented with hash tables. The GeoSPARQL plugin for GraphDB , which is used for geo-spatial data representation and querying, supports the quad prefix tree and geohash prefix tree for indexing.

Isolation Levels

GraphDB supports the read committed isolation level, where an update is only visible to other users when it has been committed.

Logging

GraphDB supports logging through logback.

Query Compilation

GraphDB allows users to define custom rulesets, which can be compiled using its internal rule compiler. The rulesets are used to generate java code and are then instantiated.

Query Interface

GraphDB supports SPARQL for RDF queries.

Storage Architecture

GraphDB supports a disk-oriented storage architecture, where all of the data is stored in disk files.

Stored Procedures

GraphDB supports rulesets that are stored as .pie files and can be compiled and instantiated.

System Architecture

All nodes in the GraphDB cluster have a shared knowledge of data structures such as the global page cache.

Views

GraphDB supports a Graph View interface which takes in SPARQL queries and retrieves data for the user, which is also visually shown.