On 5/7/14 4:37 AM, Bart Vandewoestyne wrote:
Hello list,I'm confused. I have a SPARQL-query of the following form (slightly obfuscated because of NDA-restrictions): SELECT ?val (COUNT(?id) as ?vc) WHERE { ?id<http://foo.bar/description> ?val.?id<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://foo.bar/SomeType>.} GROUP BY ?val ORDER BY DESC(?vc) LIMIT 15 When running this query multiple times, it returns different values for the ?vc counts... so it seems not deterministic. I don't see why. Is this query really not deterministic??? I'm running this on Virtuoso Version 7.1.1-dev.3208-pthreads as of Apr 17 2014. If this is not the right mailinglist to pose this question, please let me know the appropriate channel for this type of question. Kind regards, Bart
Please check the query timeout settings. This could be in the /sparql UI or in the INI (see the [SPARQL] section).
Basically, Virtuoso has an "Anytime Query" feature whereby query solutions are produced relative to query timeouts. Thus, you can increase the timeout to ensure the SPARQL solution isn't comprised of what would appear to be partial results.
Remember, unlike SQL, SPARQL is about propositions in an Open World etc.. -- Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog: http://www.openlinksw.com/blog/~kidehen Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen
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