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Transaction code RZ12 is used to define and maintain the RFC server groups parallel processed jobs. 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 parallel processing system has built-in safeguards that eliminate the possibility that a parallel job can soak up all of the resources in an SAP System and cause performance problems for other jobs or other users.
In addition to these built-in safeguards, you can optimize the sharing of resources through RFC server groups. In the context of parallel processing, a group specifies the set of SAP application servers that can be used for executing a particular program in parallel. The group used for a particular job step must be specified in the job-step program in the keyword CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP. You can also create your own more limited groups, view and maintain groups with transaction code RZ12.

Source: http://itsiti.com/rz12-rfc-server-group-maintenance

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