| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Finlay Thompson <finlay(at)dragonfly(dot)co(dot)nz> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #6275: Horrible performance regression |
| Date: | 2011-10-31 12:50:18 |
| Message-ID: | CA+TgmoZVtF=cdvzt+Q2PEzHkx-U2Sr4PgreFv0abrh2AMc6=bA@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
On Sun, Oct 30, 2011 at 10:30 PM, Finlay Thompson
<finlay(at)dragonfly(dot)co(dot)nz> wrote:
> Hi Tom
>
> Sorry for the delay.
>
> The version of postgis didn't change, and when I rolled back to
> postgresql 8.4.9 the expected performance returned. I am very confident
> the regression was caused by the 8.4.9 upgrade.
>
> Any suggestions on how to diagnose a long run script like this ? I can
> easily turn on more logging, in both cases and compare ? Can I log the
> query plans ?
The easiest thing to do is probably EXPLAIN ANALYZE each query and
post the output to this thread.
If you can't do that for some reason, there's always auto_explain, but
that has some overhead and is a bit more work to set up.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Robert Haas | 2011-10-31 13:40:35 | Re: BUG #6274: documentation on pg_attribute.atttypmod |
| Previous Message | Laurian Vostinar | 2011-10-31 12:38:11 | BUG #6279: quoting needed for column name with non ascii chars |