From: Jeff Frost <jeff@frostconsultingllc.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Index usage problem on 8.3.3
Date: Thu, 30 Oct 2008 19:47:25 -0700
Message-ID: <490A71BD.7070303@frostconsultingllc.com> (raw)
In-Reply-To: <15839.1225418158@sss.pgh.pa.us>
References: <490A4EBE.9030804@frostconsultingllc.com>
<13272.1225413116@sss.pgh.pa.us>
<490A56C1.8020804@frostconsultingllc.com>
<14519.1225415657@sss.pgh.pa.us>
<490A5DCB.9060403@frostconsultingllc.com>
<14766.1225416478@sss.pgh.pa.us>
<Pine.LNX.4.64.0810301843201.17153@discord.home.frostconsultingllc.com>
<15839.1225418158@sss.pgh.pa.us>
Tom Lane wrote:
> Jeff Frost <jeff@frostconsultingllc.com> writes:
>
>> On Thu, 30 Oct 2008, Tom Lane wrote:
>>
>>>> Any idea why I don't see it on 8.3.4?
>>>>
>>> I think it's more likely some small difference in your test conditions
>>> than any real version-to-version difference. In particular I think the
>>> "still see" test might be influenced by the ages of transactions running
>>> concurrently.
>>>
>
>
>> Interesting. This is on a test server which has no other concurrent
>> transactions and it acts the same way after I stopped 8.3.4 and started up
>> 8.3.3 again as it did before stopping 8.3.3 to bring up 8.3.4. Hrmm..I'm not
>> sure that makes sense. So, I did the test with the sql script on 8.3.3, then
>> shut down 8.3.3, started up 8.3.4 on the same data dir, ran the test
>> successfully. Next I shut down 8.3.4 and started 8.3.3 and verified that the
>> behavior was still the same on 8.3.3. I wonder what else I might be doing
>> differently.
>>
>
> Huh. That does sound like it's a version-to-version difference.
> There's nothing in the CVS log that seems related though. Are you
> willing to post your test case?
>
>
It's a customer DB, so I'll contact them and see if we can boil it down
to a test case with no sensitive data.
--
Jeff Frost, Owner <jeff@frostconsultingllc.com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 916-647-6411 FAX: 916-405-4032
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To: pgsql-performance@postgresql.org
Cc: jeff@frostconsultingllc.com, tgl@sss.pgh.pa.us
Subject: Re: Index usage problem on 8.3.3
In-Reply-To: <490A71BD.7070303@frostconsultingllc.com>
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