From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: WIP: cross column correlation ... |
Date: | 2011-02-26 06:57:54 |
Message-ID: | 201102260657.p1Q6vtL01661@momjian.us |
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Lists: | pgsql-hackers |
Robert Haas wrote:
> > Actually, we *do* have some idea which tables are hot. ?Or at least, we
> > could. ? Currently, pg_stats for tables are "timeless"; they just
> > accumulate from the last reset, which has always been a problem in
> > general for monitoring. ?If we could make top-level table and index
> > stats time-based, even in some crude way, we would know which tables
> > were currently hot. ?That would also have the benefit of making server
> > performance analysis and autotuning easier.
>
> I think there would be value in giving the DBA an easier way to see
> which tables are hot, but I am really leery about the idea of trying
> to feed that directly into the query planner. I think this is one of
> those cases where we let people tune it manually for starters, and
> then wait for feedback. Eventually someone will say "oh, I never tune
> that by hand any more, ever since I wrote this script which does the
> following computation... and I just run it out cron". And then we
> will get out the party hats. But we will never get the experience we
> need to say what that auto-tuning algorithm will be unless we first
> provide the knob for someone to fiddle with manually.
It is also possible we will implement a manual way and never get around
to automating it. :-(
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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