Re: more on delete from join

From: Walter Mitty <wamitty_at_verizon.net>
Date: Wed, 02 Sep 2009 12:31:22 GMT
Message-ID: <uAtnm.807$tl3.115_at_nwrddc01.gnilink.net>


"Joe Thurbon" <usenet_at_thurbon.com> wrote in message news:op.uzmiokv5q7k8pw_at_imac.local...
> On Wed, 02 Sep 2009 15:54:21 +1000, Marshall <marshall.spight_at_gmail.com>
> wrote:
>
> Just to be clear, I'm not using abductive perjoritively. I think that the
> idea of doing view updates by constraint-satisfaction/equation-solving is
> a terrific idea. When there is a unique solution, the approach is
> obviously not guessing.
>
> There has also been a lot of work done in forming orderings over possible
> revisions, such that some 'guesses' are considered preferable to others.
> Educated guessing, if you like.

I'm glad you made it clear that you are not using the term "abductive" pejoratively. There is room in computing for educated guesswork. Where we want to eliminate guesswork is in the determination of whether a given result is correct or not.

As I commented in a response to Marshall, a query optimizer engages in educated guesswork. Certainly evaluating the relative costs of various proposed strategies is a matter of educated guesswork. You don't know what the real cost of a strategy is until you try it. Received on Wed Sep 02 2009 - 07:31:22 CDT

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