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FWD: Re: Discussion on today's telcon

From: Michael Hausenblas <michael.hausenblas@deri.org>
Date: Fri, 05 Feb 2010 08:24:32 +0000
To: <ashok.malhotra@oracle.com>, Richard Cyganiak <richard.cyganiak@deri.org>
CC: RDB2RDF WG <public-rdb2rdf-wg@w3.org>
Message-ID: <C7918640.C9FA%michael.hausenblas@deri.org>


You sent this mail to the wrong list (that is to the old XG list ;) hence
Richard didn't receive it.

I've now forwarded it to the correct list. You might want to update your
address book with: RDB2RDF WG <public-rdb2rdf-wg@w3.org>


Dr. Michael Hausenblas
LiDRC - Linked Data Research Centre
DERI - Digital Enterprise Research Institute
NUIG - National University of Ireland, Galway
Ireland, Europe
Tel. +353 91 495730

> From: ashok malhotra <ashok.malhotra@oracle.com>
> Organization: Oracle
> Reply-To: <ashok.malhotra@oracle.com>
> Date: Tue, 02 Feb 2010 15:05:59 -0800
> To: Richard Cyganiak <richard@cyganiak.de>, RDB2RDF XG list
> <public-xg-rdb2rdf@w3.org>
> Subject: Discussion on today's telcon
> Resent-From: RDB2RDF XG list <public-xg-rdb2rdf@w3.org>
> Resent-Date: Tue, 02 Feb 2010 23:07:01 +0000
> Hi Richard:
> I'm thinking about the discussion we had on the telcon this morning and
> I have a couple of questions.
> Let us agree on the premise that MySQL does a poor job of optimizing SQL
> queries that contain
> subqueries and that using such views would entail a serious performance hit.
> You said that the R2RQ approach helps rewrite such queries in a form
> that is more performant.
> Could you give us an example of how it does that?
> Second, suppose we go with the SQL-View approach could we not add a
> Informative Note that
> said "If you are using MySQL and your view has one or more subqueries in
> it then you may take
> a performance hit.  We suggest that you rewrite the view in the
> following manner ..."
> Does that make sense?
> -- 
> All the best, Ashok
Received on Friday, 5 February 2010 08:25:10 UTC

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