OpenLink Virtuoso is a scalable, high-performance
SQL-200n compliant object-relational database
engine. It provide sophisticated database
management for SQL, XML, and RDF. All interaction
with Virtuoso occurs via its support of industry
standard query languages, protocols, APIs, and
data formats such as: ODBC, JDBC, OLE-DB, ADO.NET,
XMLA, SQL, SPARQL, XQuery, SOAP, HTTP, WebDAV,
SyncML, Atom (Publishing and Syndication), RSS,
RDF, and more.
License: GNU General Public License (GPL)
Changes:
This release has a newly optimized bitmap-intersection join, typically twice as efficient as an equivalent nested loop join. There are improvements to locking, especially for concurrency of transactions with large shared lock sets, as is the case in the TPC-H queries. As part of the completion of the Business Intelligence extensions to SPARQL (SPARQL-BI), a sampling of TPC-H queries translated into SPARQL has been released, and has been integrated into the standard demonstration database.
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