RE: CISC to RISC and Excessive Logical I/O

["Law, Tom" <actlaw@xxxxxxxx>]

All PTF's and groups have been applied.

Tom

-----Original Message-----
From: DeLong, Eric [mailto:EDeLong@Sallybeauty.com]
Sent: Wednesday, June 20, 2001 8:50 AM
To: 'MIDRANGE-L@midrange.com'
Subject: RE: CISC to RISC and Excessive Logical I/O


Have you applied the DB2 group PTFs? I know others have reported performance
related problems that were fixed once these PTFs were installed. I assume
IBM would have checked this, but who knows.........

Eric DeLong
Sally Beauty Company
MIS-Sr. Programmer/Analyst
940-898-7863 or ext. 1863
 


-----Original Message-----
From: Law, Tom [mailto:actlaw@NMHG.com]
Sent: Wednesday, June 20, 2001 8:08 AM
To: MIDRANGE-L
Subject: CISC to RISC and Excessive Logical I/O



We are doing a CISC to RISC conversion from version 3.2 to 4.5.  We are
having some slow response times in some transactions.  We were finding that
DB CPU was getting upwards of 100%.  When looking at the traces (PEX,
performance, smtrace, DBmonitor), we found that simple transactions were
getting upwards of 100,000 to over a 1,000,000 logicals I/O's with less than
320 SYNC reads.  The same functions on the CISC systems were usually less
than a 1,000 and no problems.

Data was restored to the RISC systems using the backup created from the
UPGRADE2 function on the CISC box.  I used the RSTLIB command for the data
libraries.  The data looks correct after the restore.  The only thing I can
think of that is common among different transactions is that the logicals
are not correct.  Could the logicals be the culprit?

We have had IBM look at the problem, but so far it can't be explained.  

Any info would be greatly appreciated.

Thanks

Thomas A. Law Jr.

Sr. Systems Programmer

NACCO Materials Handling Group, Inc.
Americas MIS - Danville
1813 E. Voorhees St.
Danville, IL. 61832
217-443-7622
217-443-7657 Fax
217-444-9936 Pager
E-mail: actlaw@nmhg.com

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