Re: index-only scans

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: index-only scans
Date: 2011-10-07 18:50:06
Message-ID: CA+TgmoZy=bV-7r-EyfTiiHeTQvB1+YOVAMRgA+ENjfDY=cwVAA@mail.gmail.com
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On Fri, Oct 7, 2011 at 2:40 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> Please find attached a patch implementing a basic version of
>> index-only scans.
>
> I'm making some progress with this, but I notice what seems like a
> missing feature: there needs to be a way to turn it off.  Otherwise
> performance comparisons will be difficult to impossible.
>
> The most obvious solution is a planner control GUC, perhaps
> "enable_indexonlyscan".  Anyone object, or want to bikeshed the name?

I was expecting you to NOT want that, or I would have put it in to
begin with... so go for it.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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