From: Joshua D. Drake <jd@commandprompt.com>
To: pryscila.lista@gmail.com
Cc: pgsql-performance@postgresql.org
Subject: Re: About method of PostgreSQL's Optimizer
Date: Tue, 13 Sep 2005 16:23:02 -0700
Message-ID: <43275F56.8020303@commandprompt.com> (raw)
In-Reply-To: <cf0868bd05091315503024742@mail.gmail.com>
References: <cf0868bd05091315503024742@mail.gmail.com>
Pryscila B Guttoski wrote:
> Hello all!
>
> On my master course, I'm studying the PostgreSQL's optimizer.
> I don't know if anyone in this list have been participated from the
> PostgreSQL's Optimizer development, but maybe someone can help me on
> this question.
> PostgreSQL generates all possible plans of executing the query (using an
> almost exhaustive search), then gives a cost to each plan and finally
> the cheapest one is selected for execution.
> There are other methods for query optimization, one of them is based on
> plan transformations (for example, using A-Star algorithm) instead of
> plan constructions used by PostgreSQL.
> Does anyone know why this method was choosen? Are there any papers or
> researches about it?
You may want to pass this question over to pgsql-hackers.
Sincerely,
Joshua D. Drake
>
> Thank's a lot,
> Pryscila.
--
Your PostgreSQL solutions company - Command Prompt, Inc. 1.800.492.2240
PostgreSQL Replication, Consulting, Custom Programming, 24x7 support
Managed Services, Shared and Dedicated Hosting
Co-Authors: plPHP, plPerlNG - http://www.commandprompt.com/
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: jd@commandprompt.com, pryscila.lista@gmail.com
Subject: Re: About method of PostgreSQL's Optimizer
In-Reply-To: <43275F56.8020303@commandprompt.com>
* 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