From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Mark Dilger <hornschnorter(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: improving GROUP BY estimation |
Date: | 2016-03-31 20:51:18 |
Message-ID: | 20160331205118.GA166096@alvherre.pgsql |
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Lists: | pgsql-hackers |
Tom Lane wrote:
> > The article text refers to this 1977 S. B. Yao paper "Approximating
> > block accesses in database organizations" which doesn't appear to be
> > available online, except behind ACM's paywall at
> > http://dl.acm.org/citation.cfm?id=359475
>
> Well, a CACM citation is perfectly fine by my lights (especially one
> that's that far back and therefore certainly patent-free ...)
>
> Let's use something like this:
>
> See "Approximating block accesses in database organizations", S. B. Yao,
> Communications of the ACM, Volume 20 Issue 4, April 1977 Pages 260-261
That sounds nice all right, but I'm not sure it's actually helpful,
because the article text is not available anywhere. I doubt most people
will spend 15 bucks to buy that paper ... so we don't actually know
whether the paper supports the chosen formula :-) unless you have a
CACM subscription and can verify it.
I think it's good to have the ACM reference anyway, for posterity, but
it'd be good to (additionally) have something that people can read.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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