OpenLink Virtuoso is a middleware and database engine hybrid that combines the functionality of a traditional RDBMS, ORDBMS, virtual database, RDF, XML, free-text, web application server and file server functionality in a single server product offering.
In other words the software provides transparent real-time access to disparate data sources (ODBC, JDBC, XML, and Web Services), and transparent integration of disparate application logic (e.g. Mono ECMA-CLI and J2EE integration). OpenLink Virtuoso Universal Server’s broad protocol support enables it to offer Web, File, and SQL database server functionality alongside native XML storage, and Web services platform functionality as part of a cohesive single.
It also provides a cross-platform workbench for exploiting recent technology advances in areas such as Web Services, RDF Data Management, XML Data Management, Object-Relational Data Management, and Unified Storage.
Virtuoso is a “universal server”; it enables a single multithreaded server process that implements multiple protocols.
The software is designed to take advantage of operating system threading support and multiple CPUs. It consists of a single process with an adjustable pool of threads shared between clients.
- SPARQL compliant RDF Triple Store.
- SQL-200n Object-Relational Database Engine (SQL, XML, and Free Text).
- BPEL Server and Enterprise Service Bus (integrated).
- WebDAV and Native File Server.
- Web Application Server (supporting PHP, Perl, Python, NET, JSP etc).
- Runtime Hosting for Microsoft .NET, Mono, and Java.
- Supports SQL, ODBC, JDBC, ADO.NET, OLEDB, SPARQL, XQuery, XPath, XSLT, WebDAV, HTTP, SOAP, BPEL, WS-*, UDDI, NNTP, and more.
- Implements a variety of industry standard data access APIs (client and server) that includes: ODBC, JDBC, OLE DB, ADO.NET, ADO.NET Entity Framework, XMLA.
- Backup – Online/Full/Incremental.
- XA/2PC Support.
- Connections (Multiple/Concurrent).
- Virtual/Federated (Heterogeneous).
- Full Text Search.
- Grants & Roles.
- SSL & Certificates.
- User Passwords.
- Row Level ACLS.
- Dynamic locking.
- Dirty read.
- Read committed.
- Repeatable read.
- Entity integrity.
- Referential integrity.
- Built-in WebDAV repository.
- Built-in web server.
- WebID Protocol based authentication for ODBC, JDBC, OLEDB, and ADO.NET client connections.
- Client- and server-side Semantic Pingback APIs.
- Initial support for OData’s Atom and JSON feed formats with regards to Linked Data Graph Serialization.
- Support for subproperties of Inverse Functional Properties.
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