Hi Andy, Thank you for your response.
1) Which version of Jena are you running? The used version of Jena is 2.10.1 (I will upgrade soon...) 2) How are you storing the data and how big is it? TDBFactory.createDataset(directory) COUNT(*) -> 1 224 103 350MB on disk Do you need other details ? 3) You say the query returns good results - what sort of query causes the system to freeze? This is the query returning good results appended with 3 more statements in the WHERE clause: PREFIX : <http://www.telemis.com/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT ?calculationResultCollection WHERE { ?calculationData a :CalculationData ; :value "0"^^xsd:string . ?seqCalculationDataCollection ?seqCalculationDataCollectionIndex ?calculationData . ?calculationDataCollection a :CalculationDataCollection ; :listCalculationData ?seqCalculationDataCollection . ?calculationResult a :CalculationResult ; :calculationDataCollection ?calculationDataCollection . ?seqCalculationResultCollection ?seqCalculationResultCollectionIndex ?calculationResult . ?calculationResultCollection :listCalculationResult ?seqCalculationResultCollection ; a :CalculationResultCollection . } On 7 May 2015 at 15:59, Andy Seaborne <a...@apache.org> wrote: > Hi Laurent, > > Which version of Jena are you running? How are you storing the data and > how big is it? > > You say the query returns good results - what sort of query causes the > system to freeze? > > Andy > > > On 06/05/15 15:17, Laurent Rucquoy wrote: > >> Hello, >> >> I have container resources which I want to retrieve from one of their >> elements. >> Here is an RDF/XML part of my data: >> >> >> <rdf:Description rdf:about=" >> >> http://www.telemis.com/CalculationResult/9e892a88-7257-4af3-881d-2eb304437546 >> "> >> <rdf:type rdf:resource="http://www.telemis.com/CalculationResult"/> >> <TM:uid rdf:datatype="http://www.w3.org/2001/XMLSchema#string >> ">9e892a88-7257-4af3-881d-2eb304437546</TM:uid> >> ... >> </rdf:Description> >> >> <rdf:Description rdf:nodeID="A525"> >> <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/> >> <rdf:_1 rdf:resource=" >> >> http://www.telemis.com/CalculationResult/9e892a88-7257-4af3-881d-2eb304437546 >> "/> >> <rdf:_2 rdf:resource=" >> >> http://www.telemis.com/CalculationResult/9e892a88-7257-4af3-881d-45208e34af13 >> "/> >> </rdf:Description> >> >> <rdf:Description rdf:about=" >> >> http://www.telemis.com/CalculationResultCollection/a7d808d7-7689-4dfb-82c4-b0763f0dcd34 >> "> >> <rdf:type rdf:resource=" >> http://www.telemis.com/CalculationResultCollection >> "/> >> <TM:uid rdf:datatype="http://www.w3.org/2001/XMLSchema#string >> ">a7d808d7-7689-4dfb-82c4-b0763f0dcd34</TM:uid> >> <TM:listCalculationResult rdf:nodeID="A525"/> >> </rdf:Description> >> >> >> The representation of this context could be: >> >> (CalculationResultCollection) >> --listCalculationResult--> >> (seq-blank-node) >> +--(rdf:_1)-->(CalculationResult1) >> +--(rdf:_2)-->(CalculationResult2) >> +--... >> >> I've a SPARQL query which gives me a set of CalculationResult nodes. >> My question is: by which SPARQL query can I trace back to the >> CalculationResultCollection containing resource(s) ? >> >> Here is the SPARQL query which gives me a set of CalculationResult nodes: >> >> PREFIX : <http://www.telemis.com/> >> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> >> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> >> >> SELECT ?calculationResult >> WHERE { >> ?calculationData a :CalculationData ; >> :value "0"^^xsd:string . >> ?seqCalculationDataCollection ?seqCalculationDataCollectionIndex >> ?calculationData . >> ?calculationDataCollection a :CalculationDataCollection ; >> :listCalculationData ?seqCalculationDataCollection . >> ?calculationResult a :CalculationResult ; >> :calculationDataCollection ?calculationDataCollection . >> } >> >> I tried to complete my WHERE clause with statements like I did to trace >> back to ?calculationDataCollection from ?calculationData but I cannot get >> the wanted result because the system freezes. Note that the SPARQL query >> here above returns good results. >> >> Is there a better practice to do that with acceptable performances ? >> >> Thank you in advance for your help. >> >> >> >> > -- *Laurent Rucquoy* R&D Engineer laurent.rucq...@telemis.com Tel: +32 (0) 10 48 00 27 Fax: +32 (0) 10 48 00 20 Telemis Avenue Athéna 2 1348 Louvain-la-Neuve Belgium www.telemis.com *Extending Human Life* "Au delà du Pacs...Découvrez le Macs <https://drive.google.com/a/telemis.com/file/d/0B8xEcRPFLfNdRmFRMlRSZ0k5djA/view?usp=sharing> " sur le stand Telemis #118 du 4. - 6 Juin - Centre des congrès de Bâle !
