Re: Performance differences 7.1 to 7.3

I assume that the schema is identical on both systems.

After running vacuum on both systems [for each of the underlying tables
in tpv], what does explain say about the queries?

Are the shared memory buffers identical on both systems?

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Jimmie H. Apsey
Sent: Monday, December 13, 2004 2:43 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] Performance differences 7.1 to 7.3

Hello all,
I have just loaded Postgresql 7.3.6-7 onto a new server on the
recommendation of Tom Lane. It is part of Red Hat AS 3.
I have Postgresql 7.1.3-5 running on Red Hat AS 2.1.
I have a simple view from which I select on both systems.  The 7.3.6-7
version requires 18+ seconds to do a select from a particular view.
The 7.1.3-5 version requires 3+ seconds to select from the same view.

On the 7.1.3-5 version I do:
[japsey@DCFRAID ~]$ time /usr/bin/psql mpt -c"select count(*) from tpv;"
 count
-------
 33377
(1 row)

0.000u 0.010s 0:03.55 0.2%    0+0k 0+0io 332pf+0w
[japsey@DCFRAID ~]$

And on 7.3.6-7 version I do:
[japsey@DCFRAID ~]$ time /usr/bin/psql mpt -c"select count(*) from tpv;"
 count
-------
 33377
(1 row)

0.010u 0.000s 0:18.38 0.0%    0+0k 0+0io 362pf+0w
[japsey@DCFRAID ~]$

Does anyone have any clues as to where I should be looking for
tuning/whatever?

Jim Apsey
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