| From: | "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com> |
|---|---|
| To: | "Peter Eisentraut" <peter_e(at)gmx(dot)net> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, "Greg Smith" <gsmith(at)gregsmith(dot)com> |
| Subject: | Re: 8.3devel slower than 8.2 under read-only load |
| Date: | 2007-11-26 11:12:38 |
| Message-ID: | 1d4e0c10711260312h513cac07s9c037c720e0861c1@mail.gmail.com |
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On Nov 26, 2007 11:59 AM, Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
> I have seen many applications where prepared queries caused stale plans and
> poor performance. We have in many cases achieved great performance gains by
> turning off prepared queries globally, for example in the driver layer. It
> had once gotten to a point where "uses prepared statements" was on par
> with "never touched postgresql.conf" and "never heard of VACUUM" as the worst
> performance sins. I will gladly revisit this with 8.3, but I am not very
> optimistic.
+1 on this point as I explained it earlier.
--
Guillaume
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