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03272 - *BASE Activity level?
CPI1466 during Backup Fill RESBD Structure from EBP Component StructureThis documentation is copyright by SAP AG.
*BASE Activity level?
FolksIf I may add a few observations to Ron's note....
The number of Work Processes defined in an SAP R/3 Instance is very similar
in function to setting Activity Level at the OS/400 level.... basically to
control the number of requests that can be processed at the "same time"...
I think the idea of setting this "high" is to allow the SAP experts control
this through the Instance Parameters.
The Active-to-Wait value is not a measure of any problem. This is not to
be confused with what Ron mentions ACTIVE-TO-INELIGIBLE which can take on a
value greater than 0 if your max activity level is too low.
Also, on the point of DB- and non-DB "pages" in the WRKSYSSTS display ...
the value you should be looking at is DB and non DB FAULTS - and a 100
faults per sec may in itself not be necessarily too high - unfortunately
this "depends" .... you need to see how many work processes are active.
However, if the overall response times experienced by the SAP user are fine
- why worry about a "technical value" like this!
Your note does not say that you have bad response times in general! If you
had terminated a job, you may have sparked off a DB rollback associated
with the cancelled job.
Cheers
Lloyd R. Perera
iSeries Technology Center
Building 005-2/H103
3605 Highway 52 North
Rochester, MN 55901
LPERERAZU...
Tel: (507) 286-6378 (tieline: 456-6378)
Fax: (507) 253-0424(tieline: 553-0424)
----- Forwarded by Lloyd R Perera/Rochester/IBM on 09/26/2001 03:33 PM
-----
Ron
Schmerbauch/Rochester To: sap400Zm...
/IBMZIBMUS cc:
Subject: Re: *BASE Activity
level?
09/26/2001 03:24 PM
If you press F1 when the cursor is sitting on the MaxActive text, you'll
get to see what the OS meaning of this value is, and it seems like you'd
want it set pretty high. Unfortunately, the DB also uses it. They divide
the available memory by this number to determine what a "fair share" of
memory for a job should be...so setting it low seems like a good thing.
To satisfy both needs, you should set this value as low as
possible(favoring DB), without making the Act->Inel go above 0(the
indicator that you have set it too low). The 1.2x multiplier is ok, in
your case 27, just as long as that Act->Inel stays at 0 at all times.
If QPFRADJ is set to something other than 0, the adjuster tends to raise
the max act value a bit over time, so either set QPFRADJ to 0, or check
MaxActive once in a while to make sure it isn't getting really high.
ps. To any who don't know...to find Act->Inel, Press F21, then set Expert
mode on WRKSYSSTS.
Ron Schmerbauch 507-253-4880 rschmerbZu...
iSeries 400 - ERP Development - Rochester, MN
Squash <realsquashZy...> on 09/26/2001 02:49:39 PM
To: SAP AS/400 List <sap400Zm...>
cc:
Subject: *BASE Activity level?
I'm having performance issues since my V4R5 upgrade and I noticed that my
*BASE pool activity
level is set to 500. SAP note 428855 says:
------------------------------
QBASACTLVL:
Activity Level of the *BASE Pool.Generally one or several SAP R/3 systems
are assigned to this
memory pool. The minimum size for this system value is:
QBASACTLVL > 1.2 * (number of work processes of all R/3 Systems)
A too great value causes a heavier paging.A too low value may result in
considerable performance
problems because jobs change into the Ineligible status.
------------------------------
Since I have 22 R/3 work processes that means it should be over about 27,
but 500 sounds very
excessive. I do not know what the value was for sure before the upgrade
(yeah yeah I should have
written it down), but I think it was 500 like it is now. Could this notes
actually mean the
number of total jobs running on the server?
I am having a problem where I get between 1000 and 2000 non-DB pages,
300-2000 Active -> Wait, and
around 100 non-DB faults in *BASE. This only happens after an R/3 job
hangs and I try to end it
by any means.
Please help! ARGH!
Thanks,
Andy Quaas
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