Re: Default setting for enable_hashagg_disk

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Peter Geoghegan <pg(at)bowt(dot)ie>
Cc: David Rowley <dgrowleyml(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jeff Davis <pgsql(at)j-davis(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Bruce Momjian <bruce(at)momjian(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Melanie Plageman <melanieplageman(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Default setting for enable_hashagg_disk
Date: 2020-07-13 19:57:27
Message-ID: CAKFQuwa=pw2Auipt5-Gwf8itObZDF2krj9dNiypFca=7g8uebA@mail.gmail.com
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On Mon, Jul 13, 2020 at 11:50 AM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:

>
> Primarily in favor of escape hatch:
>
> Jeff,
> DavidR,
> Pavel,
> Andres,
> Robert ??,
> Amit ??
>
>
To be clear, by "escape hatch" you mean "add a GUC that instructs the
PostgreSQL executor to ignore hash_mem when deciding whether to spill the
contents of the hash table to disk - IOW to never spill the contents of a
hash table to disk"? If so that seems separate from whether to add a
hash_mem GUC to provide finer grained control - people may well want both.

Primarily in favor of hash_mem/hash_mem_multiplier:
>
> PeterG,
> Tom,
> Alvaro,
> Tomas,
> Justin,
> DavidG,
> Jonathan Katz
>
>
I would prefer DavidJ as an abbreviation - my middle initial can be dropped
when referring to me.

David J.

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