Re: Syscaches should store negative entries, too

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Hannu Krosing <hannu(at)krosing(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Syscaches should store negative entries, too
Date: 2002-02-01 19:32:35
Message-ID: 200202011932.g11JWZM29513@candle.pha.pa.us
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Hannu Krosing wrote:
> On Thu, 2002-01-31 at 00:00, Tom Lane wrote:
> >
> > To make negative cache entries work correctly, we'd have to issue
> > cross-backend SI messages for inserts into the system catalogs, not
> > only for updates and deletes. This would mean more SI traffic than
> > there is now. I think it'd still be a win, but the case for negative
> > cache entries isn't quite as airtight as I thought. There could be
> > scenarios where the extra SI traffic outweighs the savings from avoiding
> > failing catalog searches.
> >
> > Comments anyone?
>
> The standard one - if not sure, make it an option ;)

Actually, that is not our standard comment. We want to give people a
limited set of meaningful options. If then want billions of options,
they should use Oracle. :-)

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