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?
No sorry i forgot to remove the updateProperty part.
What is strange is that when i juste create the TDB with this code, it's
size is 192MB and not 192KB ...
File directory = new File(databasePath);
if (!directory.exists()) {
directory.mkdir();
}
ARQ.setExecutionLogging(InfoLevel.NONE);
ARQ.setStrictMode();
// Direct way: Make a TDB-back Jena model in the named directory.
ds = TDBFactory.createDataset(databasePath);
2013/5/10 Frederic Toublanc <frederic.toubl...@telemis.com>
> 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
>>
>>
>
