Re: [Virtuoso-users] How to use inference rule in two graphs ?

[Renan M. de O. <re...@co...>]

Hello Ivan Mikhailov,

At this time, the performance issue is not a problem for us.
In the near future we will work on that.

Thanks for the clarifications.

Abraços,
Renan Oliveira
-----------------------------------------------
Busca & Semântica - Globo.com
(21) 2483-6727
Y! glb_renan


2011/1/12 Ivan Mikhailov <imi...@op...>

> Hello Renan,
>
> The inference works without any relation to the number of graphs used as
> data sources. OTOH querying on some list of graphs is slower than
> querying on single graph, that is true for all queries regardless using
> or not using the inference. The loss of speed may be more visible with
> inference simply because the query contains "hidden" subqueries that
> also become slower.
>
> If you have an example of a query that runs differenly depending on
> numbers of graphs that contain same data, please let me know, it might
> be a bug then.
>
> Best Regards,
>
> Ivan Mikhailov
> OpenLink Software
> http://virtuoso.openlinksw.com
>
>
> On Mon, 2011-01-10 at 17:37 -0200, Renan Moreira de Oliveira wrote:
> > Hi Aldo and Virtuoso Users
> > How are you?
> >
> > I want to use an inference rule which has the two graphs in its range,
> > or rather, I will explain the problem:
> >
> > Previously, we had a graph for everything.
> > Now, we are moving to a world where there will be several graphs to
> > separate the contexts of business.
> > We have properties's range has several classes of graphs.
> >
> > The problem is: When using inference I cannot use more than one
> > inference rule per query.
> >
> > I used two graphs with the same name as a rule. With this idea the
> > database wasn't overwritten and everything works.
> > However I had pour performance with this aproach. Since there are
> > multiple graphs.
> >
> > I wonder that if all these rules on the use of inference on the graphs
> > were a single rule it would perform better.
> > Do you have any idea?
> >
> > If there is a business rule that I can only use one rule of inference
> > by query thats all right.
> >
> > But it will be more ideal for us today if we could pass the query over
> > an inference rule.
> >
> > Query:
> >
> > define input:default-graph-uri <http://example.com/>
> > define input:inference <http://example.com/ruleset>
> >
> > select distinct ?s
> > FROM <http://example.com/sport/>
> >
> > {
> >
> >     {
> >         ?s a <http://example.com/Event> ; ?p ?o .
> >         ?o bif:contains "'League*'" .
> >     }
> >
> > }
> > LIMIT 10
> >
> > There is the possibility to continue using a rule of inference for
> > each graph
> > with this solution I would have to make two queries and do a merge.
> >
> > Can anyone help?
> > Have any idea?
> >
> >
> > Cheers,
> > Renan Oliveira
> > Y! glb_renan
> >
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