So all updates are A-box related? On Fri, Mar 30, 2012 at 8:22 AM, [email protected] <[email protected]> wrote: > Thanks a lot for your reply! > As you have assumed, I don't use neither TDB or SDB...I have an in memory- > model at runtime. > It seems to me that my model does not require complicate inferences...at every > step, > it extracts a tuple from the DB and generates the corresponding individuals > with: > model.createIndividual; the properties are added using the addProperty > method. > > The only thing that can be complicated to be calculated is that, if an > individual has the same > id of the last one processed, I extract the latter from the ontology to add > some properties... > > thanks a lot again! > > Paola > > > >>----Messaggio originale---- >>Da: [email protected] >>Data: 30/03/2012 13.56 >>A: "[email protected]"<[email protected]> >>Cc: <[email protected]> >>Ogg: Re: Re: Jena slow ontology population >> >>your hardware looks good, what type of inference does your model >>require for updates? >> >>Pellet is a very powerful reasoning system which can result in >>significant computational complexity for the subsystem to deal with >>depending on your level of inference that is of course. So you better >>know exactly what level of reasoning your application requires in >>advance to optimize the system at run-time. >> >>TBD, SDB are persistent storage options, from what you have just said >>I can assume you are using an in-memory model at run-time. >> >> >> >> >>On Fri, Mar 30, 2012 at 7:41 AM, [email protected] <[email protected]> > wrote: >>> Hi Marco, thanks a lot for your help! :-) >>> >>> Version of Jena: 2.6.4 >>> OS: Linux 64 bit >>> reasoner: Pellet >>> TDB and SDB: I don't use them, I believed that they were related to RDF > while >>> I'm using OWL, but maybe I can be wrong... >>> >>> current hw: >>> *-CPU >>> description: CPU >>> product: Intel(R) Xeon(R) CPU >>> version: Intel(R) Xeon(R) CPU E5620 >>> slot: CPU 1 >>> size: 2400MHz >>> capacity: 2400MHz >>> width: 64 bits >>> clock: 133MHz >>> *-memory >>> description: System Memory >>> physical id: 24 >>> slot: System board or motherboard >>> size: 8GiB >>> >>> If you want to know other information, please tell me! And thanks a lot > again! >>> >>> Paola >>> >>>>----Messaggio originale---- >>>>Da: [email protected] >>>>Data: 30/03/2012 11.36 >>>>A: <[email protected]>, "[email protected]"<villa.va@libero. >>> it> >>>>Ogg: Re: Jena slow ontology population >>>> >>>>can you please be a bit more specific about the configuration you have >>>>currently installed? e.g. version of Jena, back end type (TDB, SDB, >>>>in-memory), current hardware, and OS (32bit, 64bit, linux, >>>>windows,mac), and type of reasoner you use. >>>> >>>>--- >>>>Marco Neumann >>>>KONA >>>> >>>>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>>>with the lotico community discount code 'STMN' >>>>http://www.lotico.com/evt/SemTechSF2012/ >>>> >>>>On Fri, Mar 30, 2012 at 4:22 AM, [email protected] <[email protected]> >>> wrote: >>>>> Dear users, >>>>> >>>>> I am new to Jena and have a problem with Jena OWL-API. I have written > some >>>>> simple Java code that: >>>>> >>>>> 1) extracts some tuples (around 1 million tuples) of data from a database >>>>> 2) puts each of them in an ontology file using Jena library. In > particular, >>> it >>>>> takes every tuple and inserts >>>>> every element in a class of the ontology file, by using methods like >>>>> createIndividual, addproperty, model.write. >>>>> >>>>> The insertion phase is very quick when my program starts, but the >>> performances >>>>> became worse and worse as >>>>> time goes by. The DB man has told me that the database has no problems. I >>> have >>>>> run the program with 5 gigabytes >>>>> of RAM...it simply ends up to use them all. Is that normal? Do I have to >>> use a >>>>> more powerful PC to manage such >>>>> data? I can give you more details about my problem if you tell me what I >>> have >>>>> to look for exactly. >>>>> >>>>> Thanks a lot, >>>>> >>>>> Paola >>>> >>> >>> >> >> >> >>-- >> >> >>--- >>Marco Neumann >>KONA >> >>Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% >>with the lotico community discount code 'STMN' >>http://www.lotico.com/evt/SemTechSF2012/ >> > >
-- --- Marco Neumann KONA Join us at SemTech Biz in San Francisco June 3-7 2012 and save 15% with the lotico community discount code 'STMN' http://www.lotico.com/evt/SemTechSF2012/
