× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  • Subject: Re: CISC to RISC and Excessive Logical I/O
  • From: KirkG@xxxxxxxxxxxxxx
  • Date: Wed, 20 Jun 2001 07:12:50 -0700


I have had a couple of cases where the DB Group PTF has fixed performance issues. I assume that you have put on the latest cum, DB Group and Hypers...

Could you be having an issue with the 4k block size now used vs the old 520byte?
Did all of the logicals restore?
Is this RPG/C/COBOL or SQL/Query?
What is the QQRYDEGREE sysval set to?


---------------------------------
Kirk Goins
IBM Certified AS/400 Technical Solutions
DataMirror High Availability Certified
Pacific Information Systems - An IBM Premier Business Partner
503-674-2985             kirkg@pacinfosys.com
"WE KNOW TECHNOLOGY"
---------------------------------



"Law, Tom" <actlaw@NMHG.com>
Sent by: owner-midrange-l@midrange.com

06/20/01 06:08 AM
Please respond to MIDRANGE-L

       
        To:        MIDRANGE-L <MIDRANGE-L@midrange.com>
        cc:        
        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

+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---



As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.