Hello Richard
> Only queries where there is no way for the optimizer to pick a
> > database
> > appear to work on multiple databases at the same time.
>
> I think that's an accurate description of what's going on.
> The rewriting engine is not designed to work with multiple DBs, so
> sometimes it works by accident, but in general it won't.
>
Do you think that if we configure the query rewriting module to not JOIN
databases, that would work?
> > Is this something you are thinking of supporting in the Future.
>
> It would certainly be great if D2RQ had that ability. It's an open
> source project and contributions are always welcome ...
>
That's definitely something I'm interested into, and would gladly give some
of my employee's time to solve. Do you have an idea how exactly to solve
this? Contact me in pvt if you wish.
> Anyways, if you want to integrate several data stores, at this point
> I'd recommend either using the basic federated query feature of Andy
> Seaborne's ARQ, or Extract-Transfer-Load them all into one triple store.
>
you mean this ? http://jena.sourceforge.net/ARQ/service.html
So I would have several instances on D2R-Server mapping different databases
to the same ontology, then query them with ARQ using this SERVICE statement?
ETL is not the ideal for me, I have several production databases I want to
integrate, and I would avoid dealing with DW updates.
Thanks,
dfcp
>
> Best,
> Richard
>
>
> >
> > Regards
> > Dr Christian Brenninkmeijer
> > University of Manchester
> >
> >
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