From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Scrollable cursors and Sort performance |
Date: | 2006-02-27 22:55:31 |
Message-ID: | 20060227225531.GP82012@pervasive.com |
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Lists: | pgsql-hackers pgsql-patches |
On Mon, Feb 27, 2006 at 02:17:23PM +0000, Simon Riggs wrote:
> > Interesting point: how should EXPLAIN ANALYZE set these bits? For its
> > own purposes it need not request random access, but it might be
> > interesting to make it possible to examine both the random and nonrandom
> > behaviors, now that these will be significantly different performancewise.
> > Possibly we could make EXPLAIN ANALYZE EXECUTE set the random-access
> > bits.
>
> Good point. Whichever we do will be wrong in some cases.... I've no real
> opinion on this other than a vague preference for it to be quick.
Wouldn't an EXPLAIN ANALYZE DECLARE ... have the right information to
know if backward scan, etc was needed?
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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