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RFC users on message server

Users do not logon to the message server. They may only logon to one of 10 application servers. al08 shows the message server has hundreds of users, mostly of type RFC, that appear with the user id of the users on the application servers. What are these RFCs?

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2 Answers

  • Posted on Feb 25, 2016 at 08:38 AM

    Hello Clifton,

    in you scenario with the clasical implementation for the enqueue server (not ASCS instance) the Reads operations over the enqueue table from the dialog instances are done via RFC's on the Central instance.

    If you are not referring to these ones, you could check via transaction STAD with RFC calls are being executed and look if RFC logon groups have been set in the client side of the RFC.
    See SAP Note 593058: New RFC Load balancing procedure

    kind regards,

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    • Complementing Mercedes' reply, if the users are executing a transaction / report that starts parallel tasks, such parallel tasks would be executed through RFC calls.

      The logon group that would be used in this case is defined at the transaction RZ12.

      If no logon group is used by the application involved, then a built-in group called "parallel_generators" will be used.

      This group includes all active instances of the system.

      You can override it by creating this group at RZ12.

      However, be aware that anything that uses this logon group (e.g., jobs) will be affected by this change.



  • Posted on Feb 25, 2016 at 01:32 PM

    Hi Clifton, be aware that HTTP-Access will be shown as RFC most times!



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