OpenLink Software — Virtuoso Universal Server

Virtuoso Universal Server is a Data Virtualization platform, enabling fast and flexible harmonization of disparate data that increases agility for individuals and enterprises alike. Its Data Virtualization capabilities enable the construction and deployment of Knowledge Graphs atop existing data exposed by APIs such as HTTP, ODBC, JDBC, ADO.NET, OLE DB, XMLA, and many service-specific APIs (e.g., LinkedIn, Crunchbase, Twitter, Facebook, etc.).

Virtuoso Architecture


Built-in reasoning and inference functionality makes artificial intelligence, machine-learning, data lineage, and data governance integral parts of its Data Virtualization functionality, facilitating the construction of a modern Knowledge Graph for each business domain of interest (e.g., Corporate, Department, Workgroup, Project, etc.).

Each Knowledge Graph created by the Virtuoso platform manifests as a secure Semantic Web of Linked Data where Attribute-based Access Control (ABAC) provides the basis for intelligent Data Access Policies that scale across enterprise and hybrid clouds.

As demonstrated by its platform dominance in the massive Linked Open Data (LOD) Cloud — the world's largest Knowledge Graph — Virtuoso's functionality isn't challenged by performance or scalability.

DBpedia, the kernel that originally seeded the LOD Cloud, is a live instance of Virtuoso offering 24/7 access to all users, anywhere in the world.


Key benefits of the DBpedia deployment include:

  • Hyperlink-based Super Keys identify subject-matter principals referenced in Wikipedia documents

  • High-Performance Web Query Service enables delivery of SPARQL queries over HTTP, where solutions are returned using a variety of document types (HTML, CSV, JSON, XML, RDF-Turtle, and many others)

  • Scalability handles any kind of ad-hoc query while enforcing a practical "fair use" policy, enabled by a unique and innovative "Anytime Query" feature

The LOD Cloud Cache, another Virtuoso instance, provides an even larger and more challenging instance that offers access to a live Knowledge Graph comprising more than 40 Billion entity relationships deployed in line with Linked Data principles, available for querying with SPARQL and/or exploration by facet browsing, among other interfaces.

DBpedia Architecture Diagram

The DBpedia Database hosted on the live service at is also available as prebuilt Virtuoso Amazon EC2 AMI instance in the Cloud, enabling users to spin up an instance of DBpedia for their own use in minutes.

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OpenLink Software