Skip to Content
avatar image
Former Member

RAM upgrade

Hi Gurus,

We are having ECC 5.0 with 8 GB RAM as the performance of SAP is slow, We have upgrade RAM from 8 GB to 24 GB ..

Please let me know what are the parameters that we have to change after RAM upgrade for effective usage of RAM. and to increase the performance of SAp R/3 System...

Thanks in advance

VJ

Add comment
10|10000 characters needed characters exceeded

  • Get RSS Feed

5 Answers

  • Apr 16, 2009 at 08:17 AM

    You need to look into all memory parameters like,

    em/initial_size_M

    em/max_size_MB

    PHYS_MEMSIZE (depending on OS)

    Usually then you need to review the size of your Page file which usually should be 3 to 4 times the size of your RAM

    after that you can review the size of parameters

    abap/buffersize

    ztta/roll_first

    ztta/roll_area

    ztta/roll_extension

    abap/heap_area_total

    abap/heap_area_dia

    abap/heap_area_nondia

    Thats plenty to start with.

    Regards

    Juan

    Add comment
    10|10000 characters needed characters exceeded

  • avatar image
    Former Member
    Apr 16, 2009 at 08:21 AM

    It is kind of hard to give a good advice, without knowing why your system is slow. However i can give you some general guidelines. But you will have to do some research yourself if you really want to improve the situation.

    If you have performance issues on the database side, then you need to increase the database buffer. For oracle this would be the parameter db_cache_size.

    On the SAP side check ST02 for the abap buffers, especially for program buffer and table buffers.And you might also consider increasing em/initial_size_MB and abap/heap_area_total.

    Please do under all circumstances verify that you do not exceed the physical memory, because os paging is one of the top reasons for memory related performance problems.

    Best regards, Michael

    Add comment
    10|10000 characters needed characters exceeded

  • avatar image
    Former Member
    Apr 16, 2009 at 08:28 AM

    Hello

    we are using the 8gb ram on our PRD server, we have concurrent 230 users are online, we did not get any complain about degrade perforamnce.

    The performance problem arise one of the factor of the hardware but there could be many other factors which degraded performance, like expensive sql statement and system not configured properly, whcih did not optimze yet or tune yet as required! You can monitor the workload on st03n once you get complained !

    Also, you can schedule to EarlyWatch check whcih will highlight the issues and give you recommendation which need to be set on your PRD server for the better perforamcne.

    Regards

    Anwer Waseem

    Add comment
    10|10000 characters needed characters exceeded

  • avatar image
    Former Member
    Apr 16, 2009 at 08:33 AM

    If your system is windows based then check for settings /3gb, /PAE in the boot.ini

    Add comment
    10|10000 characters needed characters exceeded

  • avatar image
    Former Member
    Apr 16, 2009 at 08:36 AM

    Before changing parameter check whether your Hardware and Operating system will support 24GB RAM. If your H/W and OS is supporting 24gb then you can change the memory parameters as per SAP recommendation or as jun said

    https://websmp230.sap-ag.de/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=97497

    Edited by: ravi m on Apr 16, 2009 10:41 AM

    Add comment
    10|10000 characters needed characters exceeded