---------- Forwarded message ----------
From: Alessandro Diaferia <[email protected]>
Date: 2010/3/1
Subject: Re: [Dbpedia-discussion] limited sparql query results?
To: Hugh Williams <[email protected]>
2010/3/1 Hugh Williams <[email protected]>
> Alessandro,
>
> On 1 Mar 2010, at 10:59, Alessandro Diaferia wrote:
>
>
>
> 2010/3/1 Hugh Williams <[email protected]>
>
>> Hi Alessandro,
>>
>> By "truncated" I presume you mean it is not possible to retrieve more that
>> 1000 rows per query, which is an intentional restriction on the dbpedia
>> sparql endpoint to protect it from mis-use ie someone inadvertently or
>> otherwise overloading the service querying large result setsr. Thus as you
>> have done below, to obtain larger result sets use LiMIT and OFFSET to
>> traverse through the data in chunks if required.
>>
>> Best Regards
>> Hugh Williams
>> Professional Services
>> OpenLink Software
>> Web: http://www.openlinksw.com
>> Support: http://support.openlinksw.com
>> Forums: http://boards.openlinksw.com/support
>> Twitter: http://twitter.com/OpenLink
>>
>> On 1 Mar 2010, at 10:16, Alessandro Diaferia wrote:
>>
>> > Hello everybody,
>> > I'm new to this list.
>> >
>> > I'm using dbpedia sparql endpoint for my thesis project at university.
>> I'm developing a software that allows the user to easily make queries to the
>> dbpedia sparql endpoint. While trying some queries i noticed that some of
>> them (or all of them?) make dbpedia return a truncated reply. I can check
>> this trying to put an OFFSET that makes me see that other results are there
>> but they are just not returned all at once.
>> >
>> > Is this something i can achieve? Do you have any hint for me to get all
>> results somehow?
>> >
>> > Thank you for your time.
>> > Regards.
>> >
>> > --
>> > Alessandro Diaferia
>> > KDE Developer
>> > KDE e.V. member
>> >
>> >
>> ------------------------------------------------------------------------------
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>>
>>
> So do you suggest i should use multiple of 1000 as offset in order to
> retrive the whole set of results?
>
>
> [Hugh]Yes, that is what I am saying. As a publicly available sparql
> endpoint remember you are not the only person using the service, thus
> controls are required to ensure the service is accessible by all and to
> prevent overload of the Virtuoso Server hosting the service which ultimately
> is limited to the available resources of the hardware it runs on.
>
> Of course you can also install and load a local version of Virtuoso
> [1] and the DBpedia datasets or simply instantiate an Amazon EC2 cloud AMI
> [2], and then have unrestricted access to you local copy.
>
> Links:
>
> 1. http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/
>
> 2.
>
> http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtAWSPublicDataSets
>
> -- pre-configured and pre-loaded Virtuoso + DBpedia 3.4
>
>
> Best Regards
> Hugh Williams
> Professional Services
> OpenLink Software
> Web: http://www.openlinksw.com
> Support: http://support.openlinksw.com
> Forums: http://boards.openlinksw.com/support
> Twitter: http://twitter.com/OpenLink
>
>
> --
> Alessandro Diaferia
> KDE Developer
> KDE e.V. member
>
>
>
Thank you very much for every hint you gave me :). I'd stat with OFFSET
stuff and then see whether my needs bring me to install a local virtuoso
here.
Regards
--
Alessandro Diaferia
KDE Developer
KDE e.V. member
--
Alessandro Diaferia
KDE Developer
KDE e.V. member
------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
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