OK thats very strange because my empty TDB is not 192kb but 192MB as u can see in the screenshot below ...
[image: Images intégrées 2] 2013/5/10 Brian McBride <br...@epimorphics.com> > Hi Frederic, > > > > sorry MegaOctet = MegaBytes (in french) > > Merci. Pas probleme. > > On my machine, Windows reports an empty TDB directory as occupying 192KB. > > I have loaded 10 variations of the RDF you provided into TDB using > tdbloader. At the end of this operation Windows reports the tdb directory > size to be 198 kb. TDB contains 212 triples. If I load 20 variations I > get 422 triples and a size of 227KB. > > That is a lot less the MB you are reporting. > > Looking at your code I notice you start a transaction near the start of > saveElement and then have another begin/commit on each nested call to > updateProperty. Is that what you meant to do? > > The documentation for write transactions [1] says > > [[ > Once |dataset.commit()| or |dataset.abort()| is called, the application > needs to start a new transaction to perform further operations on the > dataset. > ]] > > You have at least read operations outside a transaction. I don't know > enough about TDB to know whether that might cause problems. > > Your example isn't complete so I can't easily run it myself. > > Brian > > > [1] http://jena.apache.org/**documentation/tdb/tdb_** > transactions.html#api-for-**transactions<http://jena.apache.org/documentation/tdb/tdb_transactions.html#api-for-transactions> > > > > > On 10/05/2013 12:51, Frederic Toublanc wrote: > >> Sorry my message was too long and couldn't be sent. >> Here is the file with all the information : rdf and implementation >> methods. >> >> >> >> >> 2013/5/10 Bill Roberts <b...@swirrl.com <mailto:b...@swirrl.com>> >> >> >> (Brian: I think the usual French word for 'byte' is 'octet', hence >> I'm assuming mo = megabyte. Frederic, is that correct?) >> >> Frederic, my experience is that an empty TDB directory is >> typically about 200MB because of the default space allocated to >> the various indexes. >> >> An example with 40 million triples is about 24GB, so an average of >> 600 bytes of total storage per triple. >> >> Best regards >> >> Bill >> >> >> >> >> On 10 May 2013, at 11:18, Brian McBride <br...@epimorphics.com >> <mailto:br...@epimorphics.com>**> wrote: >> >> > Hi Frederic, >> > >> > On 10/05/2013 09:52, Frederic Toublanc wrote: >> >> Hello everyone, >> >> >> >> I really need some info about the size of the jena TDB. >> >> We need to be sure that this triplestore will fit to our needs, >> can someone >> >> please answer the folowwing question : >> >> >> >> The size of our jena TDB is increasing as hell and we only >> insert light >> >> data (2kb per element when written to rdf). >> >> At the begining the TDB is 192 mo and after inserting 15 of >> those elements >> >> it has grown to 216 mo. >> >> Is that normal ? >> > I've used TDB a bit and not had a problem with execessive size. >> > >> > What's an "mo"? >> > >> > If you have a minimal example, I could try to reproduce. >> > >> > What data are you adding? >> > How are you adding it? >> > Are you starting from an empty TDB? >> > What OS are you running on? >> > >> > Brian >> > >> >> >> >> Thx in advance. >> >> >> > >> > >> > -- >> > Epimorphics Ltd (http://www.epimorphics.com) >> > >> > Epimorphics Ltd. is a limited company registered in England >> (number 7016688) >> > Registered address: Court Lodge, 105 High Street, Portishead, >> Bristol BS20 6PT, UK >> > >> >> >> > > -- > Epimorphics Ltd (http://www.epimorphics.com) > > Epimorphics Ltd. is a limited company registered in England (number > 7016688) > Registered address: Court Lodge, 105 High Street, Portishead, Bristol BS20 > 6PT, UK > >
