Orri Erling's Weblog

Virtuoso update

Mon, 24 Sep 2007 14:30:28 GMT

I have been occupied with getting the Virtuoso cluster to fuifull functionality. It now does insert/delete/update and select over partitions spread over multiple instances and can send co-located joins and other co-located query fragments over to partner nodes. Of course, the more functionality is transferred per message, the better.

Most of the code is definitely written. Now it is a question of testing and adding optimizations here and there, also detecting distributed deadlocks.

I'll go to the SABRE conference in Leipzig this week, where we present an update on Virtuoso. This is an updated verversion of the Virtuoso intro paper, now also at the Virtuoso web site.

In another month, I'll be at the RDF Relational Mapping workshop in Cambridge, MA. There will be more updates on our results before then.

Recent Virtuoso Developments

Tue, 19 Sep 2006 10:59:30 GMT

We have been extensively working on virtual database refinements. There aremany SQL cost model adjustments to better model distributed queries and wenow support direct access to Oracle and Informix statistics system tables.Thus, when you attach a table from one or the other, you automatically getup to date statistics. This helps Virtuoso optimize distributed queries.Also the documentation is updated as concerns these, with a new section ondistributed query optimization.

On the applications side, we have been keeping up with the SIOC RDF ontologydevelopments. All ODS applications now make their data available as SIOCgraphs for download and SPARQL query access.

What is most exciting however is our advance in mapping relational data intoRDF. We now have a mapping language that makes arbitrary legacy data in Virtuoso or elsewhere in the relational world RDF queriable. We will putout a white paper on this in a few days.

Also we have some innovations in mind for optimizing the physical storage ofRDF triples. We keep experimenting, now with our sights set to the highend of triple storage, towards billion triple data sets. We areexperimenting with a new more space efficient index structure for betterworking set behavior. Next week will yield the first results.

SQL Database Databases Virtuoso Programming Semantic Web SPARQL

Recent Virtuoso Developments

Tue, 19 Sep 2006 10:59:30 GMT

On the applications side, we have been keeping up with the SIOC RDF ontologydevelopments. All ODS applications now make their data available as SIOCgraphs for download and SPARQL query access.

SQL Database Databases Virtuoso Programming Semantic Web SPARQL