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Re: bitmap AM design

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql(at)mohawksoft(dot)com
Cc: "Victor Y(dot) Yegorov" <viy(at)mits(dot)lv>,"Pg Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: bitmap AM design
Date: 2005-03-01 18:11:00
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
pgsql(at)mohawksoft(dot)com writes:
> Tom, I posted a message about a week ago (I forget the name) about a
> persistent reference index, sort of like CTID, but basically a table
> lookup. The idea is to simulate a structure that ISAM sort of techniques
> can work in PostgreSQL.

> Eliminating the bitmap index issue for a moment, how hard would it be to
> create a reference table like index?

I didn't see the point.  You cannot actually use CTID that way (at least
not without fundamentally redesigning our MVCC machinery) and anything
else you might come up with is effectively just a random unique ID that
has to be mapped through an index to find the row.  I don't see the
advantage compared to any ordinary application-defined primary key.

			regards, tom lane

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