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Former Member

Buffer Paramater Settings

Hi Experts,

In our Development and Production systems , we have been Observed that ,

Lot of Swaps at Program Buffer (PXA) Especially Development systems ..

Some times we were experianced Lot of swaps Export and Import Buffers also

When we saw at ST02 There was less Space at program buffer and export and Import Buffers .. , and also extended meory use is bit high ..

Could you please let me know that . If system is running with more swaps ( in St02) , How can we avoid this Swaps ?

Is there any formula to fine tune buffer parameters like program buffer, table buffer , Export/Import ,Roll area,HeapMemory to make the system up and running with good peformance ?

and also Paging area .........?

Thanks & Regards,

Praveen.

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4 Answers

  • Best Answer
    Feb 19, 2011 at 07:45 AM

    Hi praveen kondabala

    Kindly go thru the SAP Note 88416 - Zero administration memory management

    Regards

    Sriram

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    Former Member
    Jan 19, 2011 at 01:47 PM

    Hello Praveen,

    I recommend you buy this book:

    SAP Performance Optimization Guide (6th Edition)

    It will answer all your above questions + lots more.

    And it is much cheaper than SAP training on the topic.

    SAP's policy is (as far as I can remember)

    that 10.000 swaps per day can be ignored

    for the PXA buffer. Keep in mind that transports

    or ABAP changes by the programmers will

    also cause PXA invalidations.

    Regards,

    Mark

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    • Hi,

      its like Michael said, PXA (ABAP Programm Buffer) swaps are normal but should not exceed 10.000 Swaps per Day.

      The export/import buffer is not performance critical, swapping in this Buffer is allowed. If you have enough physical memory available, you can think about increasing this Buffer.

      I also recommend you to buy the SAP Performance Tuning Book (SAP Press) which is the perfect guide for questions like this.

      Kind regards

      Manuel

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    Former Member
    Jan 18, 2011 at 02:23 PM

    You can increase the value of profile parameter abap/buffersize. Don't know what the current size and the number of swaps is.. You can put for eg. 250M extra space and check for the next couple of days how the system behaves..

    Bear in mind that all this additional space should fit into the extended memory. So after increasing certain parameters, you should check on OS level with command sappfpar check pf=<instance profile> if it still fits..

    Kind regards,

    Mark

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    Former Member
    Jan 25, 2011 at 06:03 AM

    Hi,

    Do you take any ofline backups of your developement system ??? if yes then is it weekly or monthly ????if it is weekly need not to worry as the buffer gets reset as system gets recycled.and if theres no offline backups then u need to monitor it atleast a month...then plan to tune the buffer.

    Swaps is the number (counter) by which old objects in the buffer is over written by the new objects from database .

    i would suggest to monitor the swaps for a certain period

    Edited by: rajubhattacharjee on Jan 25, 2011 7:04 AM

    Edited by: rajubhattacharjee on Jan 25, 2011 7:13 AM

    Edited by: rajubhattacharjee on Jan 25, 2011 7:23 AM

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