Re: No heap lookups on index

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Scott <davids(at)apptechsys(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: No heap lookups on index
Date: 2006-01-18 22:38:53
Message-ID: 20060118223853.GW17896@pervasive.com
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On Wed, Jan 18, 2006 at 04:02:45PM -0500, Jonah H. Harris wrote:
> David,
>
> You can find some of this discussion in "Much Ado About COUNT(*)". Related
> to that discussion, I had written a patch which added visibility information
> to the indexes.
>
> If you're interested in the patch and/or consulting, contact me offline.

Does the patch change all indexes across the board? Do you have any
performance numbers?

I suspect that in some situations storing visibility info in the index
would be a big win; if that's the case it would be very good if there
was an option that allowed it. Perhaps this could be done using a
different index access method...
--
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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