| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, Grzegorz Jaskiewicz <gj(at)pointblue(dot)com(dot)pl>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Simple postgresql.conf wizard |
| Date: | 2008-11-14 16:43:15 |
| Message-ID: | 28223.1226680995@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> You're right, I haven't, but yes I know that's a problem. We've chatted
> about that with Greg sometimes. It would be nice to have more stable
> plans. My favorite idea is to stop using the current relation size in
> the planner, and use the value snapshotted at ANALYZE instead.
Sorry, that's a nonstarter. We used to act that way and it was
completely fatal to plan quality in very many typical scenarios.
IMHO, the only thing worse than an unstable plan is a stable one.
regards, tom lane
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