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Re: Index usage problem on 8.3.3

From: Jeff Frost <jeff(at)frostconsultingllc(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Index usage problem on 8.3.3
Date: 2008-10-31 02:47:25
Message-ID: 490A71BD.7070303@frostconsultingllc.com (view raw or flat)
Thread:
Lists: pgsql-performance

Tom Lane wrote:
> Jeff Frost <jeff(at)frostconsultingllc(dot)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(at)frostconsultingllc(dot)com>
Frost Consulting, LLC 	http://www.frostconsultingllc.com/
Phone: 916-647-6411	FAX: 916-405-4032

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Subject: Re: Index usage problem on 8.3.3
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