From: Simon Riggs <simon@2ndquadrant.com>
To: Mark Kirkwood <markir@paradise.net.nz>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: Pål Stenslet <paal.stenslet@exie.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Should Oracle outperform PostgreSQL on a complex
Date: Sun, 18 Dec 2005 10:27:50 +0000
Message-ID: <1134901670.2964.140.camel@localhost.localdomain> (raw)
In-Reply-To: <43A4C348.7050703@paradise.net.nz>
References: <200512170428.jBH4S2W23715@candle.pha.pa.us>
<1134810953.2964.117.camel@localhost.localdomain>
<8627.1134843222@sss.pgh.pa.us>
<43A4C348.7050703@paradise.net.nz>
On Sun, 2005-12-18 at 15:02 +1300, Mark Kirkwood wrote:
> Yeah - the quoted method of "make a cartesian product of the dimensions
> and then join to the fact all at once" is not actually used (as written)
> in many implementations
But it is used in some, which is why I mentioned it.
I gave two implementations, that is just (1)
> - probably for the reasons you are pointing out.
> I found these two papers whilst browsing:
>
>
> http://www.cs.brown.edu/courses/cs227/Papers/Indexing/O'NeilGraefe.pdf
> http://www.dama.upc.edu/downloads/jaguilar-2005-4.pdf
>
>
> They seem to be describing a more subtle method making use of join
> indexes and bitmapped indexes.
Which is the option (2) I described.
Best Regards, Simon Riggs
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: simon@2ndquadrant.com, markir@paradise.net.nz, tgl@sss.pgh.pa.us, pgman@candle.pha.pa.us, paal.stenslet@exie.com
Subject: Re: Should Oracle outperform PostgreSQL on a complex
In-Reply-To: <1134901670.2964.140.camel@localhost.localdomain>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox