From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jeff Frost <jeff@frostconsultingllc.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Index usage problem on 8.3.3
Date: Thu, 30 Oct 2008 21:55:58 -0400
Message-ID: <15839.1225418158@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.LNX.4.64.0810301843201.17153@discord.home.frostconsultingllc.com>
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>
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?
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, jeff@frostconsultingllc.com
Subject: Re: Index usage problem on 8.3.3
In-Reply-To: <15839.1225418158@sss.pgh.pa.us>
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