Hi Roberto, Have you tuned your Virtuoso Server for hosting large datasets as indicated in the Bulk loader document, which directs you to :
http://www.openlinksw.com/dataspace/dav/wiki/Main/VirtRDFPerformanceTuning
as it source as if the server is under resourced ?
The LOD Cloud Cache (lod.openlinksw.com) is currently down for major Virtuoso
Server update and load of 50+ billion triples, and was announced on twitter
etc. It should be back online soon ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
10 Burlington Mall Road, Suite 265, Burlington MA 01803
Weblog -- http://www.openlinksw.com/blogs/
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Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology Providers
On 29 Feb 2012, at 12:27, Roberto Mirizzi wrote:
> Hi all,
> I think one of our IP addresses has been blacklistened by dbpedia
> servers. We use these addresses just for research purposes within my
> university. Who should I contact for kindly asking to enable it again?
>
> Ok, the obvious answer to this question could be: "install a local dump
> of DBpedia and don't bother DBpedia server".
> Well, that's what I would really like to do. We used to have dbpedia
> dumps 3.5. Then, we recently decided to install a brand new fresh
> version with dump 3.7. The nightmare started. :-) Here's my story.
>
> I successfully installed Virtuoso Opensource 6.1.4 (latest version) on a
> Linux Ubuntu 10.04 64bit distribution with 32GB ram.
> Then, I tried several times to follow the instructions at:
> http://www.openlinksw.com/dataspace/dav/wiki/Main/VirtBulkRDFLoaderExampleDbpedia
>
> (I successfully did the same a couple of years ago for dump 3.5).
> Unfortunately, after one hour or two of correct execution, the
> rdf_loader_run() procedure stucks, the virtuoso-t process result active
> (at least it seems to be active since a "ps aux|grep virtuoso" shows me
> the process has not been killed), but everything concerning virtuoso
> seems to be dead: the web interface http://localhost:8890 does not
> respond anymore, a "top" command from the shell does not show "virtuoso"
> (while in the beginning it used 100% of CPU), the "isql-v" command
> allows me to correctly log in, but then the instructions does not respond.
> The virtuoso.log file does not show anything wrong.
>
> Finally, I've observed (from the virtuoso.log file) some of the .nt
> files of the dump contain incorrect triples. For example, I get this
> error message:
> File /dbpedia-dump/3.7/en/external_links_en.nt error 23000 SR133: Can
> not set NULL to not nullable column 'DB.DBA.RDF_QUAD.O'
>
> The problem is that when such an error is encountered, I think the
> loading of that file does not go on. In other words, I could lose
> important triples.
>
> Does anyone has any successfully/unsuccessfully experiences about
> installing DBpedia dump 3.7 on Virtuoso?
>
> ps: where is the openlinksw beloved endpoint?
> http://lod.openlinksw.com/sparql/
>
>
> Thanks in advance,
> roberto
>
> --
> Roberto Mirizzi
> Politecnico of Bari
> http://sisinflab.poliba.it/mirizzi
>
>
>
> ------------------------------------------------------------------------------
> Virtualization & Cloud Management Using Capacity Planning
> Cloud computing makes use of virtualization - but cloud computing
> also focuses on allowing computing to be delivered as a service.
> http://www.accelacomm.com/jaw/sfnl/114/51521223/
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