| From: | Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Cc: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>, "Decibel!" <decibel(at)decibel(dot)org>, "Christopher Browne" <cbbrowne(at)gmail(dot)com> |
| Subject: | Re: [PATCHES] Better default_statistics_target |
| Date: | 2008-02-01 04:19:59 |
| Message-ID: | 200801312319.59723.xzilla@users.sourceforge.net |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
On Thursday 31 January 2008 09:55, Kevin Grittner wrote:
> >>> On Wed, Jan 30, 2008 at 8:13 PM, in message
>
> <d6d6637f0801301813n64fa58eu76385cf8a621907(at)mail(dot)gmail(dot)com>, "Christopher
>
> Browne" <cbbrowne(at)gmail(dot)com> wrote:
> > There seems to be *plenty* of evidence out there that the performance
> > penalty would NOT be "essentially zero."
>
> I can confirm that I have had performance tank because of boosting
> the statistics target for selected columns. It appeared to be time
> spent in the planning phase, not a bad plan choice. Reducing the
> numbers restored decent performance.
>
Bad plans from boosting to 100 or less? Or something much higher?
--
Robert Treat
Build A Brighter LAMP :: Linux Apache {middleware} PostgreSQL
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