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From Andy Seaborne <andy.seabo...@epimorphics.com>
Subject Re: A question about Jena Sparql Engine and the TDB Store
Date Fri, 18 Mar 2011 13:59:15 GMT

>> I might be wrong but I thinkg the Jena TDB store will be able to
>> perform multiple named graphs queries much more efficiently if all the
>> graphs involved by the query belong to the same TDB store rather that
>> going through a generic indirection involving a generic wrapper. Would
>> be worth checking that claim by reading the jena source code though.

True.

> My assumption is, that a query cannot be forwarded to TDB if the
> graphs do not all belong to the same TDB store, so that 466 cannot be
> resolved without the changes described in 467. We will see...

ARQ also can query across a dataset made up of graphs backed by 
different storage subsystems.  It's not as efficient as all in one TDB 
store though.

	Andy

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