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00215 - What is Temporary Storage Explanation

00215 - What is Temporary Storage Explanation

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What is Temporary Storage Explanation

Volker

I apologize for the misinformation, but I'm still very new to the SAP
terminology,

Our version is 4.6C running on OS 4.5

Our Development box
As 2 instance DEV(00) 3 environment and QAS(01) 2 environment



Robert Morin



-----Original Message-----
From: Gueldenpfennig, Volker [mailto:volker.gueldenpfennigZs...]
Sent: Friday, January 05, 2001 2:13 AM
To: 'Robert Morin'; Sap400ZMag. Linz. At (E-mail)
Subject: RE: What is Temporary Storage Explanation


Hello Robert,

unfortunately I can't see on what SAP release you are running.
I don't understand what you are meaning with DEV (3 instances). Do you
really use 3 instances to the system DEV ? Where is this good for ?

But there are 2 major parts in temp storage:
a) the SAP buffers, extended memory ... that you can see on ST02
b) the storage that every WP needs for it's ODPs

to a)
The top-part of ST02 (Buffer) has mostly defined about 1-2 GB storage that
are allocated just after start of SAP without any user logged on. The bottom
part (SAP memory) is now very different. The most interesting figure is the
Extended Memory and there "In memory". This is the storage that can be used
as maximum for the extended memory. Up to 4.5B this is allocated
dynamically. So, you can setup up to the maximum of 8 GB and it only uses
the storage it needs. This will increase when more user log on. When you are
using 4.6x this is pre-allocated storage. The complete storage that is
defined in "in memory" will be already allocated at the start of SAP even
when no user logged on. So then it is useful to set this to a useful value.
It is recommended to abserve the "Max. use" and set it that way that
normally after a few days system-run the "Max. use" is about 80% of the "In
memory".

to b)
Every WP uses up to 1200 ODPs (open data pathes). Each ODP consumes 30-300
KB. Our experience is that this is mostly 300 KB. As there are only a few
ODPs at the startup of SAP and this increases while the system stays up, the
storage increases over the time the system is active. The 1200 ODPs is set
because of performance reasons. You have to possibilities in order to reduce
this part of memory:
1) Cycle your WPs some times (e.g. every 24 hours, without restarting SAP!)
as described in note 182207. Then every time the WPs restart themselves they
clean the ODPs up to 0 as they die and are getting restarted.
2) Reduce the maximum amount of ODPs with the following instance-parameter:
Standard (default):
dbs/db4/odp_threshold =1200
dbs/db4/odp_commit_threshold =1210
dbs/db4/odp_open_threshold =1250

Useful reduction:
dbs/db4/odp_threshold =800
dbs/db4/odp_commit_threshold =810
dbs/db4/odp_open_threshold =850
(When you reduce this much more, this will really do have an impact on your
performance!!!)

You might check option 1. Some customers are doing this and say that there
are no performance impacts but big reductions in temp-storage.
But as I said: Don't complain about performance afterwards!

Regards

Volker Gueldenpfennig

> -----Original Message-----
> From: Robert Morin [mailto:Robert.MorinZF...]
> Sent: Freitag, 5. Januar 2001 00:05
> To: Sap400ZMag. Linz. At (E-mail)
> Subject: What is Temporary Storage Explanation
>
>
> Hello people,
>
> First thing first:
>
> I hope the new year brings everybody new hope, patience and
> happiness in
> this wonderful career of IT that we so carefully selected
>
> Now to the point:
> Can someone explain to me the following questions.
> We just finish our initial production roll out on of our
> production machine.
> We roll-out only the CS (customer file) with 4 user's as a
> pilot. Now on our
> PRODUCTION box, the temporary storage used for our minimum
> process at the
> time of writing this was
> Subsystem: R3_00 Job: *ALL Temporary storage:
> 4,156,416 KB.
>
> So you can imagine that our DEV (3 instance) & QA (2
> instance) environment
> which are on the same box with at it's peek 3 programmer and
> 3 power user.
> Now my temporary storage is
> Subsystem: R3_00 Job: *ALL Temporary storage:
> 6,397,952 KB.
> Subsystem: R3_01 Job: *ALL Temporary storage:
> 4,411,392 KB.
>
> My manager would like to know and so would I. Is there an
> explanation or a
> formula that will explain theses numbers as we roll-out more
> user's and
> module what type of increase can we expect? Is there a way to
> control the
> utilization of the Qtemp in SAP?
>
> So many questions so little time.
>
> Robert Morin
>
>

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