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Former Member

Free Memory In ST06

Dear gurus,

When SAP started for the first time, I check ST06, and free memory is around 50% of total physical memory.

After 1-2 days, it is now less than 10%, EVEN THOUGH there's no user logged in.

I check in ST02, current extended and other memory areas are low.

It seems that after usage, the memory is not released to OS ?

Is it normal?

Regards,

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    author's profile photo Former Member
    Former Member
    Posted on Dec 14, 2011 at 06:09 AM

    Hi,

    Can you please tell me that your system is 32 bit or 64 bit?

    Also please check the following SAP notes..

    Note 1001015 - saposcol/st06: wrong average values for memory/swap

    Note 189072 - ST06/OS06: No data or incorrect data displayed

    Also check the list of background jobs..

    Regards

    Bhuban

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    • Former Member Former Member

      Hi,

      Since you have a new system, you would need to tune memory parameters based on your hardware configuration.

      This would be an iterative process and would continue until the system becomes stable over a period of time.

      Please search for memory related SAP notes related to your server / OS configuration and setup parameters accordingly.

      Links shared above should help you understand what parameters need to be tuned.

      Hope this helps.

      Regards,

      Varun

  • author's profile photo Former Member
    Former Member
    Posted on Dec 14, 2011 at 05:46 AM

    Hello,

    Did you check if any background jobs are running in your system.

    regards,

    Venkat

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 14, 2011 at 06:14 AM

    Looks like your Swap memory is not configured correctly. It should ideally be 3 * Physical memory.

    Also check for number of swaps in ST02.

    Tuning memory is quite tricky and you would need to read and understand a lot of terms.

    For a start, read

    http://help.sap.com/saphelp_nw04/helpdata/en/02/9625e3538111d1891b0000e8322f96/content.htm

    http://help.sap.com/saphelp_nw04/helpdata/en/02/96253c538111d1891b0000e8322f96/frameset.htm

    Based on your system config, please check for notes and tune memory parameters accordingly.

    Hope this helps.

    Regards,

    Varun

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  • Posted on Dec 14, 2011 at 10:40 AM
    When SAP started for the first time, I check ST06, and free memory is around 50% of total physical memory.
    After 1-2 days, it is now less than 10%, EVEN THOUGH there's no user logged in.
    
    I check in ST02, current extended and other memory areas are low.
    It seems that after usage, the memory is not released to OS ?
    
    Is it normal?

    Your OS version ? How much memory you have at all ? How you configure file system cache ?

    In St02 --> detail --> storage what do you see ? what db you use? Anything also on this server ?

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