Re: prefix btree implementation - Mailing list pgsql-hackers

From Bruce Momjian
Subject Re: prefix btree implementation
Date
Msg-id 200510070243.j972hsS01351@candle.pha.pa.us
Whole thread Raw
In response to Re: prefix btree implementation  ("Jim C. Nasby" <jnasby@pervasive.com>)
Responses Re: prefix btree implementation
List pgsql-hackers
Jim C. Nasby wrote:
> On Wed, Oct 05, 2005 at 03:40:43PM -0700, Qingqing Zhou wrote:
> > We do the prefix sharing when we build up index only, never on the fly.
> 
> So are you saying that inserts of new data wouldn't make any use of
> this? ISTM that greatly reduces the usefulness, though I'm not objecting
> because compression during build is probably better than none at all. Is
> there a technical reason compression can't be used during normal
> operations?

Added to TODO:

* Consider compressing indexes by storing key prefix values shared by several rows as a single index entry

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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