On 8/14/19 6:07 AM, Jérémie Roquet wrote: > Hi! > > Le mer. 14 août 2019 à 01:10, Kingsley Idehen <kide...@openlinksw.com> a > écrit : >> We have loaded Wikidata into a Virtuoso instance accessible via SPARQL [1]. >> One benefit is helping to understand Wikidata using our Faceted Browsing >> Interface for Entity Relationship Types [2][3]. > That's great news, thanks!
Hi Jérémie, You are welcome! See responses below. > >> Feedback always welcome too :) > So, I've eagerly tried a very simple SPARQL query with a huge result > set, the complete version of which¹ I've known for several years to > timeout in both the official Blazegraph instance and a personal > Blazegraph instance with supposedly all time limits removed: > > PREFIX wd: <http://www.wikidata.org/entity/> > PREFIX wdt: <http://www.wikidata.org/prop/direct/> > > SELECT ?person WHERE { > ?person wdt:P31 wd:Q5 > } > > … and while the Virtuoso instance manages to answer pretty quickly, it > seems that it's cutting the result set at 100k triples. Is it the > expected behavior? Yes. > If so, I suggest you show that in the UI because > apart from the improbable round number of triples, it's not obvious > that the result set is incomplete (in this case, the LDF endpoint > tells us that there should be around 5,4M triples²). > > Thanks again! > > ¹ ie. using the wikibase:label service > ² > https://query.wikidata.org/bigdata/ldf?subject=&predicate=wdt%3AP31&object=wd%3AQ5 If you open up your browser's inspector you will see: cache-control: max-age=3600 content-encoding: gzip content-type: text/html; charset=UTF-8 date: Wed, 14 Aug 2019 16:47:47 GMT expires: Wed, 14 Aug 2019 17:47:47 GMT server: Virtuoso/08.03.3315 (Linux) x86_64-generic-linux-glibc25 VDB status: 200 strict-transport-security: max-age=15768000 vary: Accept-Encoding x-sparql-default-graph: http://www.wikidata.org/ *x-sparql-maxrows:* 100000 In addition, note that Virtuoso has an "Anytime Query" feature [1][2] that it uses to drive a "Fair Use" policy that ensures an endpoint is able to handle a cocktail of query types from users and bots. This is also how we handle DBpedia and DBpedia-Live instances [3]. Naturally, HTTP response metadata will also inform you when this kicks in. [1] http://docs.openlinksw.com/virtuoso/anytimequeries/ [2] http://vos.openlinksw.com/owiki/wiki/VOS/VirtTipsAndTricksAnytimeSPARQLQuery [3] https://wiki.dbpedia.org/public-sparql-endpoint -- Regards, Kingsley Idehen Founder & CEO OpenLink Software Home Page: http://www.openlinksw.com Community Support: https://community.openlinksw.com Weblogs (Blogs): Company Blog: https://medium.com/openlink-software-blog Virtuoso Blog: https://medium.com/virtuoso-blog Data Access Drivers Blog: https://medium.com/openlink-odbc-jdbc-ado-net-data-access-drivers Personal Weblogs (Blogs): Medium Blog: https://medium.com/@kidehen Legacy Blogs: http://www.openlinksw.com/blog/~kidehen/ http://kidehen.blogspot.com Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
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