Re: What makes such a big difference?

I ran into a problem at one shop with older keyed physical files with the access path size set to *MAX4GB. Changing it to *MAX1TB greatly improved performance. Not sure if your files are keyed though...

Kelley

----- Original Message ----- From: <fu_james@xxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Friday, July 27, 2007 2:17 PM
Subject: What makes such a big difference?

We are updating a field (company code) in some very large physical files.
These PFs are created by DDS, without journaling.
We use the similar RPG program (very simple, just read and update) on them
and the system environment is exactly the same.
One batch job for each PF. Some jobs can update more than 5 millions record
per hour, some can do 1 millions
per hour, while some can only do 100 thousands per hour. At first, I think
the reason might be the number of dependent logical files.
But then I found a PF with 36 dependent LFs is 10 times faster than a PF
with 30 dependent LFs. Any clues for me?
Thanks...

Best Regards.

James Fu

TDL Group Corp. (Tim Hortons)
Oakville, Ontario
Direct: 905-339-5798
fu_james@xxxxxxxxxxxxxx
Web: http://www.timhortons.com

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