Thanks for the reply Birgitta... We are seeing sporadic performance issues even navigating IBM menus on the green screen. So this is well beyond the SQE I believe.
I cannot put my finger on it. I will open a ticket with IBM.
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Birgitta Hauser
Sent: Thursday, September 21, 2023 3:41 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Performance Degradation after 7.5 upgrade
It is hard to say anything, without knowing your SQL-Statement, your data and your access path.
Finally there are only 2 things you/the programmer/database administrator can affect:
1. The way how to write a query (multiple statements returning the same information written in different ways can get optimized differently)
2. Providing the best/right access paths
... and finally it can be missing PTFs or missing PTF etc.
... in this case you should open a PMR at IBM.
... but without seeing it and without analysis (analysis tools are available in ACS) it is like looking into a crystal ball.
If you need help you may contact me directly.
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
Modernization – Education – Consulting on IBM i
IBM Champion since 2020
"Shoot for the moon, even if you miss, you'll land among the stars." (Les Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them and keeping them!"
"Train people well enough so they can leave, treat them well enough so they don't want to. " (Richard Branson)
"Learning is experience … everything else is only information!" (Albert Einstein)
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Greg Wilburn
Sent: Wednesday, 20 September 2023 20:07
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Performance Degradation after 7.5 upgrade
Should have mentioned that I've already done this...
I built some indexes that were well-used.
We haven't IPL'd for a few weeks.
The select I did in RSS which took almost 2 minutes ran in 26 milliseconds directly thereafter.
Again - I was accessing the data by selecting "where" on two key fields.
That's why this seems odd.
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of x y
Sent: Wednesday, September 20, 2023 1:30 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Performance Degradation after 7.5 upgrade
It's possible SQL is busy rebuilding MTI's. After I re-IPL, there's a significant performance hit for the first few transactions of a database-intensive app, and then performance gets back to normal. Check your Index Advisor to see what's being built, watch the Index Advisor for the next few days, and make permanent indexes based on SYSIXADV.
On Wed, Sep 20, 2023 at 8:58 AM Greg Wilburn < gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
We are experiencing significant performance issues after our upgrade
from
7.3 to 7.5 of OS/400. We have the latest cume installed.
The performance issues seem to be directly related to database access
- both SQL and legacy applications.
I just ran a simple query from Run SQL scripts directly selecting 5
rows from a large file, using the same keys as an existing logical file.
It took almost 2 minutes to return the data.
There are dozens of examples I've seen over the previous weeks since
the upgrade.
I'm not asking for possible solutions without providing more info...
Just asking if anyone else has experience this? Are there known
issues with database response times?
(i.e. qsys2.user_info_basic)
TIA,
Greg
[Logo]<https://www.totalbizfulfillment.com/> Greg Wilburn
Director of IT
301.895.3792 ext. 1231
301.895.3895 direct
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@totalbizfulfillment.c
om>
1 Corporate Dr
Grantsville, MD 21536
www.totalbizfulfillment.com<http://www.totalbizfulfillment.com>
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