Hi Oliver,
Have you looked at the Virtuoso RDF Proxy URI Service as documented at:
http://docs.openlinksw.com/virtuoso/rdfsparql.html#rdfproxyservice
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
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On 5 Sep 2010, at 06:34, Olivier Berger wrote:
> Hi.
>
> Is it possible to use virtuoso as a SPARQL proxy/cache for another
> SPARQL endpoint ?
>
> We have already deployed a D2R server in order to provide RDF out of a
> RDBMS (postgres). But queries tend to explode (maybe our mapping's
> fault) and render data inaccessible (D2R and or Postgres
> crashed/stuck/busy or whatever). Data in the postgres DB is constant, so
> we may as well have some RDF cache instead of replaying the SQL queries
> allover again.
>
> I'm thinking of using Virtuoso sponger to fetch RDF triples from the D2R
> SPARQL endpoint (with DESCRIBEs ?), and cache in turn (and even do
> reasoning maybe). Then we would just have to switch our SPARQL queries
> over to Virtuoso instead of D2R.
>
> Is this possible and are there docs explaining how to plug Virtuoso
> (sponger?) to another SPARQL endpoint ?
>
> I think another option would be to port our mapping to Virtuoso so that
> it does the job to query the Postgres DB and produce triples, but as the
> mapping is a bit complex, I'd like to try a faster way.
> Also, such a setup may allow us to mix in virtuoso data coming from
> several such D2R (ou other) SPARQL endpoints for richer/larger queries.
>
> Thanks in advance.
> --
> Olivier BERGER <olivier.ber...@it-sudparis.eu>
> http://www-public.it-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
> Ingénieur Recherche - Dept INF
> Institut TELECOM, SudParis (http://www.it-sudparis.eu/), Evry (France)
>
>
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