From: Alvaro Herrera <alvherre@commandprompt.com>
To: Jim C. Nasby <jim@nasby.net>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-hackers@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: [HACKERS] Hints proposal
Date: Fri, 13 Oct 2006 21:29:01 -0400
Message-ID: <20061014012901.GC28725@alvh.no-ip.org> (raw)
In-Reply-To: <20061013233615.GA381@nasby.net>
References: <20061012151439.GT28647@nasby.net>
<200610121358.22739.josh@agliodbs.com>
<20061013161614.GT28647@nasby.net>
<200610131557.24420.josh@agliodbs.com>
<20061013233615.GA381@nasby.net>
Jim C. Nasby wrote:
> So, does anyone out there have a plan for how we could give user's the
> ability to control the planner at a per-table level in 8.3 or even 8.4?
Per-table level? Some of the problems that have been put forward have
to do with table combinations (for example selectivity of joins), so not
all problems will be solved with a per-table design.
I think if it were per table, you could get away with storing stuff in
pg_statistics or some such. But how do you express statistics for
joins? How do you express cross-column correlation?
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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To: pgsql-performance@postgresql.org
Cc: alvherre@commandprompt.com, jim@nasby.net, josh@agliodbs.com, pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] Hints proposal
In-Reply-To: <20061014012901.GC28725@alvh.no-ip.org>
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