Do you have any information for me regarding the issue mentioned below? Best regards, Ken
> -----Original Message----- > From: owlim-discussion-boun...@ontotext.com [mailto:owlim-discussion- > boun...@ontotext.com] On Behalf Of Wenzel, Ken > Sent: Tuesday, March 12, 2013 2:44 PM > To: owlim-discussion@ontotext.com > Subject: [Owlim-discussion] OWLIM SE - Slow query with dataset containing > null context > > Hello, > > I've noticed that querying OWLIM SE while supplying a dataset containing > some named graphs along with the Sesame default context (Java null value, > <sesame:nil> in Sesame 2.7.0) > is around 8 times slower for some queries as simply executing the query > without a specific dataset. > Both queries were executed with includeInferred=true. > > I've configured OWLIM SE to use context indexes by setting > <http://www.ontotext.com/trree/owlim#enable-context-index> to "true" > but I'm unsure if OWLIM really uses them. > > As can be seen from the following log file excerpts, matching the pattern [ > sender http://www.w3.org/2004/02/skos/core#altLabel l ] > takes 15 ms with contexts and 0 ms without contexts. > > Log with contexts: > ---------------------- > Query ID = 4 > [ sender http://www.w3.org/2004/02/skos/core#altLabel l ], Collection size = > 48.0, Predicate collection size = 48, Unique subjects = 48, Unique objects = > 46, Complexity = 48.0 > Query complexity = 48.0 > [DEBUG] 2013-03-12 13:32:23,111 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Dl_FED_ > VL__m[10162], rdfs:subClassOf[6], *, *, useContextfilterMask=296) > [DEBUG] 2013-03-12 13:32:23,111 [repositories/enilink] wrappedIter->true > [DEBUG] 2013-03-12 13:32:23,111 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Signal[94 > 74], owl:onProperty[19], > http://enilink.net/vocab/xil/signals#hatSender[9462], *, > useContextfilterMask=296) > [DEBUG] 2013-03-12 13:32:23,111 [repositories/enilink] wrappedIter->false > [DEBUG] 2013-03-12 13:32:23,126 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Signal[94 > 74], owl:onProperty[19], > http://enilink.net/vocab/xil/signals#hatSender[9462], *, > useContextfilterMask=296) > [DEBUG] 2013-03-12 13:32:23,126 [repositories/enilink] wrappedIter->false > > Log without contexts: > ---------------------- > Query ID = 5 > [ sender http://www.w3.org/2004/02/skos/core#altLabel l ], Collection size = > 48.0, Predicate collection size = 48, Unique subjects = 48, Unique objects = > 46, Complexity = 48.0 > Query complexity = 48.0 > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Dl_FED_ > VL__m[10162], rdfs:subClassOf[6], *, *, filterMask=296) > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] wrappedIter->true > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Signal[94 > 74], owl:onProperty[19], > http://enilink.net/vocab/xil/signals#hatSender[9462], *, filterMask=296) > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] wrappedIter->false > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] > AVLRepository.getStatements(http://enilink.net/vocab/xil/signals#Dl_FED_ > VL__m[10162], owl:onProperty[19], > http://enilink.net/vocab/xil/signals#hatSender[9462], *, filterMask=296) > [DEBUG] 2013-03-12 13:34:15,243 [repositories/enilink] wrappedIter->false > > Do you have any suggestions on improving the query performance? > > Best regards, > Ken > _______________________________________________ > Owlim-discussion mailing list > Owlim-discussion@ontotext.com > http://ontomail.semdata.org/cgi-bin/mailman/listinfo/owlim-discussion _______________________________________________ Owlim-discussion mailing list Owlim-discussion@ontotext.com http://ontomail.semdata.org/cgi-bin/mailman/listinfo/owlim-discussion
