AllegroGraph

What AllegroGraph is

AllegroGraph is a persistent graph database designed for large graph datasets, using disk-based storage and efficient memory utilization. It supports RDF triples and quads, generic graphs, and vectors, with SPARQL, RDFS++ reasoning, and Prolog for querying and reasoning. Other capabilities include geospatial and temporal reasoning, social network analysis, range queries, and vector search, including the ability to store embedding vectors and integrate with large language models. Transaction and recovery features include ACID compliance, online backups, point-in-time recovery, replication, and warm standby. Security controls include role-based permissions, repository access controls, security filters, and triple-level controls. It supports LDAP and OAuth/OIDC authentication and TLS for client connections; its security overview recommends third-party tools for encryption at rest. Clients include Java, Python, and Lisp, alongside REST and a browser-based WebView. AllegroGraph runs natively on x86-64 Linux and documents Docker, virtual machine, and cloud options. Its free edition has no expiration or license key requirement and is limited to 5,000,000 triples.