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Re: show Heap Fetches in EXPLAIN for index-only scans

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: show Heap Fetches in EXPLAIN for index-only scans
Date: 2012-01-13 15:29:28
Message-ID: CABUevEw8189hPjRoq70TVG0OzfjQwWoyit=h9XhOZFCxeuen9w@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Jan 13, 2012 at 16:21, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> I think that people who are using index-only scans are going to want
> some way to find out the degree to which the scans are in fact
> index-only.
>
> So here's a 5-line patch that adds the number of heap fetches to the
> EXPLAIN ANALYZE output.  This might not be all the instrumentation
> we'll ever want here, but I think we at least want this much.

Agreed.

Would also be good to have counter sin pg_stat_* for this, since you'd
usually want to look at this kind of data over time as well. In your
plans? ;)

-- 
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

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