On 25 Feb 2012, at 04:11, Osman, Taha wrote: > Hi,
Hi Taha, Apologies for the brief reply. > we were > surprised that Jena TDB's (0.8.10) response time was extremely slow in > general and did not return any results (Java runs out of heap space) for > all the UOBM queries even while using the least expressive RDFS reasoning. > Can you shed light on the matter? > and here is how we fire the queries: > > Model jenaModel = TDBFactory.createModel(rootDirPath + repoName); > InfModel jenaInfModel = ModelFactory.createRDFSModel(jenaModel); Here's the problem. You're not really testing TDB here, but TDB with an in-memory reasoner on top. This will also prevent TDB optimising queries, and use heap space that TDB wouldn't. IIRC the TDB loader has an option to perform RDFS reasoning as you load. That should work much better. Damian
