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Procedure documentationDefining RFC Groups for Parallel Processing Jobs

 

It is possible to define logon groups to avoid overloading the system with parallel RFCs. For more information on parallel RFCs, see Parallel Processing of Jobs with Asynchronous RFC.

By default, a parallel-processed job uses all qualified servers in an SAP System according to automatic resource-allocation rules. However, by defining RFC groups, you can control which servers can be used for parallel-processed jobs. An RFC group specifies the set of allowed servers for a particular parallel-processed job. The group that is used for a specific job step must be specified in the job step program in the key word CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP.

Procedure

  1. Call Transaction RZ12 ( Start of the navigation path Administration Next navigation step System Adminstration Next navigation step Administration Next navigation step Network Next navigation step RFC destinations End of the navigation path). This displays a table showing:

    • The names of already-defined RFC groups, or logon groups or server groups

    • A list of the servers, or instances, in your SAP System

    • The current status (running/not-running) of each server

  2. To define an RFC group, choose Start of the navigation path Edit Next navigation step Create Assignment End of the navigation path. In the field Server Group, either choose a name from the list of groups that have already been defined or enter a new name. In the Instance field, select one of the servers from the list. Repeat this step for each server that should belong to the group or to assign a server to more than one group. When a server belongs to more than one group, jobs that use the group will compete for free work processes on the shared server(s). You must ensure that the group you create is also specified in the ABAP program that will use the group.

  3. Complete the Resource Detemination area in order to complete the group definition. Choose Accept to save the assignment.

Note Note

Descriptions of the individual parameters of the logon group can be gound in the F1 help in the system as well as in the document Configuring SAP Systems for Parallel RFCs. For more information, see SAP Notes 527481Information published on SAP site and 74141Information published on SAP site.

End of the note.

Caution Caution

It can only be advised to deviate from the predefined SAP standard values for the parameter in very exceptional situations and must then be sone with great care and must be tested with the relevant load on the system.

End of the caution.

Example

RFC groups can allow different parallel-processed jobs to run at the same time without competing for the same servers. In this case, the different groups that were used by the jobs would specify different server sets.

RFC groups can also separate parallel-processed jobs from servers being used by dialog users. In this case, the group used by a job would name servers other than those in the logon groups for users.