Re: Re: Rethinking hint bits WAS: Protecting against unexpected zero-pages: proposal

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Josh Berkus <josh(at)agliodbs(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Re: Rethinking hint bits WAS: Protecting against unexpected zero-pages: proposal
Date: 2010-11-15 19:41:51
Message-ID: 5161.1289850111@sss.pgh.pa.us
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Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Mon, Nov 15, 2010 at 2:06 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
>>> I'm not ignoring them; I just choose to work on other issues, since
>>> there is no viable proposal for fixing them. I don't intend to put
>>> my time into dead ends.

>> So, that's a "show me a patch and we'll talk"? Understood, then.

> Or even just a proposal.

Well, he did have a proposal ... it just wasn't very credible. Moving
the hint bits around is at best a zero-sum game; it seems likely to
degrade cases we now handle well more than it improves cases we don't.
I think what we need is a fundamentally new idea, and I've not seen one.

regards, tom lane

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