Hello Stefano,
On Thu, 2012-06-21 at 18:39 +0100, Stefano Ortona wrote:
> my query is very simple:
>
> "
> select distinct ?0 ?1 ...?x ...?100
> WHERE
> {
> { <certain-dbpedia-resource> rdf:type ?x.}
> }
> "
>
> Basically i wanna retrieve the rdf:types for 100 different dbpedia resources,
> is that ~200K of text? (seems strange)
> I'm using the DBPedia SPARQL endpoint, http://dbpedia.org/sparql.
7 lines of SQL text per triple pattern if default graph is not
specified, 9 lines if it is specified. So it's some about 700 or 900
lines, not 10000 . Terrible but not fatal.
I'd query
SELECT DISTINCT ?t
from some graph if it is known
WHERE
{ ?s a ?t . FILTER ( ?s IN (<resource1>, <resource2>,
<resource3> ...)) }
A single triple pattern with IN operator would be much cheaper.
Best Regards,
Ivan Mikhailov
OpenLink Software
http://virtuoso.openlinksw.com
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