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Many Dialog work process in PRIV mode

ztta/roll_extension 4000000000

Hello All

Many Dialog work processes are moved into Private mode occasionally. Customer wants to check the whether SAP parameters regarding the PRIV mode Work processes has configured correctly.

Please let me know how to check and suggest the value to the customer to resolve the issue.

My system configuration


AIX 6.1, oracle, ECC 6

Kernel version -


em/initial_size_MB 6144 ztta/roll_extension 4000000000 abap/heap_area_dia 2000000000 abap/heap_area_nondia 2000000000 EM/TOTAL_SIZE_MB


abap/heap_area_total 4000000000

rdisp/max_priv_time 600

rdisp/wppriv_max_no DEFAULT

Total RAM is 76GB



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2 Answers

  • Feb 07, 2014 at 02:58 PM

    Dear Subbu,

    Change the one parameters value.

    ztta/roll_first =1

    (1024 -> 1)

    Thanks & Regards,

    V Srinivasan

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  • Feb 08, 2014 at 11:49 PM

    If the work process are going to PRIV mode this means that the Extend Memory is exhausted.

    As you are running AIX, probably have set the parameter ES/TABLE = SHM_SEGS. Therefore the Extend Memory is controlled by the parameter EM/TOTAL_SIZE_MB.

    See note 445533.

    The area limited by the parameter EM/TOTAL_SIZE_MB is shared between all work process. Each individual work process can grow individually in the Extend Memory until the limit of ztta/roll_extension.


    EM/TOTAL_SIZE_MB = Total of EM to all Work Process;

    ztta/roll_extension = limit of EM of an individual WP;

    To avoid the PRIV mode you should increase the Extend Memory. You only need to check if you have to increase the individual work process extend memory area (ztta/roll_extension) or the total area.

    It is possible to check the EM utilization in ST02 transaction. Click twice in the Extend Memory and you see something

    Extended memory Dialog session kB 97.656

    Nondialog sess. kB 97.656

    Available kB 4.190.208

    Used kB 122.880

    Maximum used kB 237.568

    If the Maximum used reach the size of EM/TOTAL_SIZE_MB this means that the bottleneck is in the area shared by all work process.

    Best regards

    Clebio Dossa

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