On 1/29/13 5:12 AM, Julien Cojan wrote:
Hi,This seems to be the same question as in [1], though there was no answer to that.The fact that virtuoso doesn't always provide all the results to a query is disturbing.
Again, it would be disturbing if it allowed anyone to use the instance without consideration for others. Do you have any idea how many concurrent connections hit this instance at any given time of the day, from anywhere on the Web?
Yes, via SPARQL Protocol (an HTTP service) you are able to determine if results are complete or note. Please understand, we set up this instance with a specific goal in mind i.e., we are not going to allow crawlers hog the instance at the expense of others.Is there a way to know when this happens ?
If it's a processing time issue, why doesn't it just fail with a timeout exception or a warning as it does sometimes ?
Because you have two parameters in play, a timeout (which you can set) and total query cost. What you should do is increase the timeout and then use offset and limit. Tailor it to your needs. You use cursor over the data instead of blindly asking for everything that matches your query.
Also note, this is why we provide an Amazon EC2 AMI for you to construct your own instance and use it exclusively in the manner that works best for you. Same thing applies if you want to install on your own setup.
Again, DBpedia endpoint is for World Wide access. Its configured to meet that need.
Please search search on this forum (go back a few years) for examples and comments about these matters.
Endpoints: 1. http://dbpedia.org/sparql -- basic setup2. http://lod.openlinksw.com/sparql -- larger setup which can handle more concurrent users and expensive query combos.
Kingsley
Regards, Julien [1] http://sourceforge.net/mailarchive/message.php?msg_id=30351258 ------------------------------------------------------------------------ *De: *"Kingsley Idehen" <kide...@openlinksw.com> *À: *dbpedia-discussion@lists.sourceforge.net *Envoyé: *Lundi 28 Janvier 2013 22:36:59 *Objet: *Re: [Dbpedia-discussion] Sparql query vs. web interface On 1/28/13 4:26 PM, Andrea Di Menna wrote: Thanks Kingsley. Is the same reason why all the resources are not listed in the http://dbpedia.org/page/G%C3%BCtersloh page as reverse dbpedia-owl:birthPlace property? Yes, since this URL will give varying results, subject what other connections to doing with the DBMS: http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=prefix+dbpedia-owl%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0Aselect+%3Fs+where+%7B%3Fs+dbpedia-owl%3AbirthPlace+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E%7D&format=text%2Fhtml&timeout=0&debug=on Query Definition: http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&qtxt=prefix+dbpedia-owl%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0Aselect+%3Fs+where+%7B%3Fs+dbpedia-owl%3AbirthPlace+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E%7D&format=text%2Fhtml&timeout=0&debug=on LOD Cloud: http://lod.openlinksw.com/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=prefix+dbpedia-owl%3A+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%0D%0Aselect+%3Fs+where+%7B%3Fs+dbpedia-owl%3AbirthPlace+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E%7D&format=text%2Fhtml&timeout=0&debug=on Kingsley Thanks 2013/1/28 Kingsley Idehen <kide...@openlinksw.com <mailto:kide...@openlinksw.com>> On 1/28/13 3:53 PM, Andrea Di Menna wrote: Hi Kingsley, just wanted to add that sometimes. The same query: http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=select+%3Fperson+where+%7B%3Fperson+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2FbirthPlace%3E+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E+%7D&format=text%2Fhtml&timeout=2000 from time to time returns only 5 results (which are the ones shown here http://dbpedia.org/page/G%C3%BCtersloh ) When the query returns 11 elements they are: http://dbpedia.org/resource/Hans_Werner_Henze http://dbpedia.org/resource/Diana_Amft http://dbpedia.org/resource/Ludwig_M%C3%BCller_(theologian) <http://dbpedia.org/resource/Ludwig_M%C3%BCller_%28theologian%29> http://dbpedia.org/resource/Hanns-Heinrich_Lohmann http://dbpedia.org/resource/Andy_Duguid http://dbpedia.org/resource/Wolf_Hilbertz http://dbpedia.org/resource/Simon_Gosejohann http://dbpedia.org/resource/Friedrich_Daniel_von_Recklinghausen http://dbpedia.org/resource/Theodor_Rumpel_(surgeon) <http://dbpedia.org/resource/Theodor_Rumpel_%28surgeon%29> http://dbpedia.org/resource/Thorsten_Stuckmann http://dbpedia.org/resource/Annabel_J%C3%A4ger By checking the first one, you can see that it has http://dbpedia.org/page/G%C3%BCtersloh as dbpedia-owl:birthPlace. But this is not shown in the http://dbpedia.org/page/G%C3%BCtersloh page as a reverse property. Do you know what is wrong? Basic SPARQL endpoint is protected by query cost controls based on the backed end machine config etc.. That's why I used the lod.openlinksw.com <http://lod.openlinksw.com> instance as an example since that's a bigger machine setup with the same data. See: http://dbpedia.org/describe/?url=http%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh -- this has more results because it makes use of DBMS hosted cursors for scrolling through the dataset . You can use OFFSET and LIMIT to page through the data. I am sure there are some old posts about these matters re. DBpedia's SPARQL endpoint. Kingsley Regards 2013/1/28 Kingsley Idehen <kide...@openlinksw.com <mailto:kide...@openlinksw.com>> On 1/28/13 3:15 PM, Daniel Naber wrote: Hi, I'd like to find all persons born in a given city. At http://de.dbpedia.org/page/G%C3%BCtersloh I see about 96 persons. When I query with Sparql, I only get 11. The query I use is this: select ?person where {?person <http://dbpedia.org/ontology/birthPlace> <http://dbpedia.org/resource/G%C3%BCtersloh>} The endpoint I use is http://dbpedia.org/sparql. How can I get all the results that are shown on the web page? Regards Daniel Try: http://lod.openlinksw.com/sparql?default-graph-uri=&query=select+distinct+%3Fperson+where+%7B%3Fperson+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2FbirthPlace%3E+%0D%0A%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E%7D&format=text%2Fhtml&timeout=30000&debug=on Query Definition: http://lod.openlinksw.com/sparql?default-graph-uri=&qtxt=select+distinct+%3Fperson+where+%7B%3Fperson+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2FbirthPlace%3E+%0D%0A%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FG%25C3%25BCtersloh%3E%7D&format=text%2Fhtml&timeout=30000&debug=on--Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog: http://www.openlinksw.com/blog/~kidehen <http://www.openlinksw.com/blog/%7Ekidehen> Twitter/Identi.ca handle: @kidehen Google+ Profile: https://plus.google.com/112399767740508618350/about LinkedIn Profile: http://www.linkedin.com/in/kidehen ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET <http://ASP.NET>, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net <mailto:Dbpedia-discussion@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion--Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web:http://www.openlinksw.com Personal Weblog:http://www.openlinksw.com/blog/~kidehen <http://www.openlinksw.com/blog/%7Ekidehen> Twitter/Identi.ca handle: @kidehen Google+ Profile:https://plus.google.com/112399767740508618350/about LinkedIn Profile:http://www.linkedin.com/in/kidehen--Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web:http://www.openlinksw.com Personal Weblog:http://www.openlinksw.com/blog/~kidehen Twitter/Identi.ca handle: @kidehen Google+ Profile:https://plus.google.com/112399767740508618350/about LinkedIn Profile:http://www.linkedin.com/in/kidehen ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
-- Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog: http://www.openlinksw.com/blog/~kidehen Twitter/Identi.ca handle: @kidehen Google+ Profile: https://plus.google.com/112399767740508618350/about LinkedIn Profile: http://www.linkedin.com/in/kidehen
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