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Ah one of the best reasons I cite for turning off the performance adjustment on systems with lots of SQL work. That said, you can also set the system up so the pools that run the SQL do not change, allowing the balance of the system to self tune, and keeping the SQL from loosing it's mind occasionally.

As to the "most environments", since a very large number of shops have very little SQL, they prefer record level access, it is true. Sadly the number of shops using SQL is still relatively low, although growing fast..

Jim Oberholtzer
CEO/Chief Technical Architect
Agile Technology Architects, LLC


On 2/3/2011 8:00 AM, McGovern, Sean wrote:
I'm surprised to read that a QPFRADJ (Performance adjustment) value of 2
(Adjustment at IPL and automatic adjustment) is "...a good option for
most environments."

With this setting, I find that SQL re-optimises frequently as '...the
size or paging option of the storage pool has changed.' (CPI4323 with
reason code 11).



-----Original Message-----
From:midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Luis Rodriguez
Sent: 03 February 2011 13:18
To: Midrange Systems Technical Discussion
Subject: IBM 7.1 performance paper

Hi all,

A recent IBM Systems Mag blog article at
http://ibmsystemsmag.blogs.com/you_and_i/2011/02/qdls-s36e-and-520-in-a-
512-world-an-ibm-i-qa.html

brought to my attention this nice paper about IBM i 7.1 Performance:
http://www-03.ibm.com/systems/resources/pcrm.pdf

Hope you find as interesting as I did...

Regards,

Luis Rodriguez
IBM Certified Systems Expert - eServer i5 iSeries

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