| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] Hints proposal |
| Date: | 2006-10-14 01:29:01 |
| Message-ID: | 20061014012901.GC28725@alvh.no-ip.org |
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| Lists: | pgsql-hackers pgsql-performance |
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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