On May 21, 2010, at 1:08 AM, Christian Fuerber wrote:

> Hi Holger,
> 
> thank you for the quick response. Yes, I could successfully connect to
> a graph in virtuoso that has 245 triples. But the SPIN constraint
> checks are not working on the graph's data. I receive an error "Could
> not run checker" when executing "Refresh and show problems
> (constraints)". SPARQL in TBC is also not working. I just can see the
> classes and instances in the editor.

Are there any more details available, e.g. the Error Log?

And yes, TDB will almost certainly be faster for SPARQL, because it will "live" 
in the same JVM, so no communication overhead is needed. Furthermore, TDB is 
better optimized to work with the ARQ SPARQL engine.

Thanks
Holger

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