| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Stuart Bishop <stuart(at)stuartbishop(dot)net> |
| Cc: | "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: A pessimistic planner |
| Date: | 2014-11-21 05:12:05 |
| Message-ID: | 21114.1416546725@sss.pgh.pa.us |
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| Lists: | pgsql-performance |
Stuart Bishop <stuart(at)stuartbishop(dot)net> writes:
> I was wondering if the planner should be much more pessimistic,
> trusting in Murphy's Law and assuming the worst case is the likely
> case? Would this give me a much more consistent system?
Well, it would give uniformly awful plans for cases where fast-start
plans are actually useful ... and there are plenty.
We do need to think of ways to account for risk, but I don't think
that jamming the tiller all the way over is likely to be a net
improvement.
regards, tom lane
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