| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Remove xmin and cmin from frozen tuples |
| Date: | 2005-09-06 20:58:28 |
| Message-ID: | 20050906205828.GW60481@pervasive.com |
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| Lists: | pgsql-hackers |
On Fri, Sep 02, 2005 at 03:51:15PM -0400, Bruce Momjian wrote:
> One possible solution is to create a phantom cid which represents a
> cmin/cmax pair and is stored in local memory.
If we're going to look at doing that I think it would also be good to
consider including xmin and xmax as well. This might require persisting
to disk, but for transactions that touch a number of tuples it could
potentially be a big win (imagine being able to shrink all 4 fields down
to a single int; a 45% space reduction).
--
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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