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Memory related query

Hello Gurus,

I want to analyse an SAP system if it is using the available memory in an optimised manner

From your past experiences , can you let me know the thumb rule to assess?

Say for Ex , I have the below memory assigned to my host

             total       used       free     shared    buffers     cached

Mem:          2019       1060        958          0          0         47

-/+ buffers/cache:       1013       1006

Swap:           19          0         19

Total:        2039       1060        978

and I guess we can have 60% allocated to SAP and 30% for the database.

Can you on a high level let me know , what are the main parameters which I need to check in order to make sure that my SAP server is properly using the allocated memory.

My DB size is 15 TB.

Basically i want to know the most important oracle and sap parameters to consider.

Thanks,

Sowmya

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3 Answers

  • Best Answer
    Jan 13, 2016 at 06:32 AM

    Hi Sowmya

    1. Is this SAP CI & DI on single system? could you share the  SAP & OS/DB version details?

    2. Yes, You have to use the SAP Application + OS for 70 % & DB 30 % of over all memory

    3. During the peak time are you facing slowness or any other issues?

    Regards

    SS

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  • Jan 13, 2016 at 06:32 AM

    Hi Sowmya,

    You can check the memory usage in tcode /ST02 . Here you can see how much paging , EM is being used. In here you can see memory related parameters under SAP memory tab.

    Also you can run sappfpar command to check.

    As such there are many parameters that needs to be considered based on the kernel version (7.2X , 7.4X) and OS related, these might include extended memory , paging , heap related parameters.

    Hope this helps.

    Regards

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  • Jan 15, 2016 at 08:28 PM

    Hi,

    You can refer these notes :

    117907 - Display of SAP Memory usage in SM04 and ST02

    2085980 - New features in memory management as of Kernel Release 7.40

    Also please have a look at

    SAP Memory Management System - Application Server Infrastructure - SCN Wiki

    Hope this info helps !!

    Do let us know your further queries 😊

    best regards

    Manjunath Hanmantgad

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