Tim Haynes wrote: > Hi, > > OpenLink Software is pleased to announce a new release of Virtuoso, > Open-Source Edition, version 5.0.6. > > On the RDF side, the bitmap intersection join has been optimized so that it > is now typically twice as efficient as an equivalent nested loop join. > > In some cases XML trees in the object position in RDF quads were > incorrectly indexed, leading to failure to retrieve quads. This is fixed > and should problems occur in existing databases, they can be corrected by > simply dropping and re-creating an index. > > The cost model has been further tuned. We have run the TPC-H queries with > larger databases and have profiled it extensively. There are improvements > to locking, especially for concurrency of transactions with large shared > lock sets, as is the case in the TPC-H queries. The rules stipulate that > these have to be run with repeatable read. There are also optimizations for > decimal floating point. > > As part of the completion of our Business Intelligence extensions to SPARQL > (SPARQL-BI), we released a sampling of TPC-H queries translated into > SPARQL, and integrated this into the standard demonstration database. The > new demo database provides a live sample of the TPC-H schema and instance > data in linked-data form, complete with SPARQL-BI variants of the standard > TPC-H queries. Relational-to-RDF model-mapping is now demonstrably mature > and robust enough for enterprise-grade business-intelligence applications. > > For more details, see the release notes: > http://sourceforge.net/project/shownotes.php?group_id=161622&release_id=587253 > > Other links: > > Virtuoso Open Source Edition Links: > Home Page: http://virtuoso.openlinksw.com/wiki/main/ > Download Page: http://virtuoso.openlinksw.com/wiki/main/Main/VOSDownload > > OpenLink Data Spaces Links: > Home Page: http://virtuoso.openlinksw.com/wiki/main/Main/OdsIndex > SPARQL Usage Examples (re. SIOC, FOAF, AtomOWL, SKOS): > http://virtuoso.openlinksw.com/wiki/main/Main/ODSSIOCRef > > OpenLink AJAX Toolkit (OAT) Links: > Project Page: http://sourceforge.net/projects/oat > Live Demonstration: http://demo.openlinksw.com/oatdemo > Interactive SPARQL Demo: http://demo.openlinksw.com/isparql/ > RDF Browser Demo: http://demo.openlinksw.com/rdfbrowser
Tim, this list is closed. Please use the new one on the W3C. -- Stefano Mazzocchi Digital Libraries Research Group Research Scientist Massachusetts Institute of Technology E25-131, 77 Massachusetts Ave skype: stefanomazzocchi Cambridge, MA 02139-4307, USA email: stefanom at mit . edu ------------------------------------------------------------------- _______________________________________________ Linking-open-data mailing list [email protected] http://simile.mit.edu/mailman/listinfo/linking-open-data
