Re: [Virtuoso-users] Problem running Virtuoso

On 3/28/11 7:17 PM, Alex Genadinik wrote: Hello, I am installing Virtuoso and I think I got the ODBC connection right, but I am having trouble getting the http://localhost:8890/conductor link to work with Apache. It just gives me a file not found. I am using Ubuntu and I downloaded the binary

[Virtuoso-users] Problem running Virtuoso

Hello, I am installing Virtuoso and I think I got the ODBC connection right, but I am having trouble getting the http://localhost:8890/conductor link to work with Apache. It just gives me a file not found. I am using Ubuntu and I downloaded the binary to make the install. I guess my VAD (Virtu

Re: [Virtuoso-users] Prepared statement performance with SPARQL

Hi Timo, Is the performance difference the same following repeat execution of the prepared statement with URI binding ? it would still worth seeing some pseudo code showing how the prepared statement is being set and the parameters passed to it ? Best Regards Hugh Williams Professional Service

Re: [Virtuoso-users] SPARQL with optional and filter combination: Virtuoso Bug or "works as designed"?

Hello Martin, Yes that was my bug in SPARQL-to-SQL front-end. The fix is attached and now it is on its way to the VOS head and Virtuoso Universal Server. Note that there is an issue with the discussed query. When the first version of the SPARQL support was added to Virtuoso, there was no final W3

[Virtuoso-users] Strange result while querying an OWL ressource

Hello every one, I am currently working on semantic data using a virtuoso server. But one of my OWL data file is giving me some difficulties. The source of the file is here : ftp://ftp.solgenomics.net/pathways/lycocyc_2.0.biopax.owl The parsing from raptor is ok and returns 214717 triples So m

Re: [Virtuoso-users] Prepared statement performance with SPARQL

Hi. The problem seems to be more general and not just related to predicates. I have for example this query : SELECT DISTINCT ?dimension WHERE { ?item ?_c3 ?_c4 , ?_c5 , ?dimension } which I transform into the following query sparql SELECT DISTINCT ?dimension WHERE { ?item `iri(??)` `iri(??)`

Re: [Virtuoso-users] SPARQL with optional and filter combination: Virtuoso Bug or "works as designed"?

Hi Martin, Yes, this is currently being looked into by development, we should have some feedback for you soon ... Best Regards Hugh Williams Professional Services OpenLink Software Web: http://www.openlinksw.com Support: http://support.openlinksw.com Forums: http://boards.openlinksw.com/support

Re: [Virtuoso-users] SPARQL with optional and filter combination: Virtuoso Bug or "works as designed"?

Hi, has anyone looked into the problem I described on March 7? See below. Thanks & Regards, Martin Am 07.03.2011 12:09, schrieb Martin Gerlach: > Hi, > > I observed the following SPARQL behavior with Virtuoso Open Source, > Version 06.01.3127, running on Linux version 2.6.27.56-0.1-xen > (geek

Re: [Virtuoso-users] Prepared statement performance with SPARQL

Hi Timo, Can you please provide more details on this issue possibly with some pseudo code to demonstrate what is being done ? Are you getting the expected performance benefits when using prepared statements to bind variables to literal values but not when binding variables to predicates, for

[Virtuoso-users] Prepared statement performance with SPARQL

Hi. I have noticed that when using SPARQL over JDBC as prepared statements I get a huge performance penalty when binding variables acting as predicates via prepared statements. I'd like to bind all node constants via prepared statements. How can I avoid the performance penalty? Br, Timo We