Re: Index usage problem on 8.3.3 - Mailing list pgsql-performance

From Jeff Frost
Subject Re: Index usage problem on 8.3.3
Date
Msg-id 490A71BD.7070303@frostconsultingllc.com
Whole thread Raw
In response to Re: Index usage problem on 8.3.3  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Index usage problem on 8.3.3
List pgsql-performance


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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