Activation group heap is a type of temporary storage that an application may use. This document describes how to use the system service tools macro ACTIVATIONHEAPS output to determine the jobs that own the largest activation group heaps and the current sizes. This support can also be used to monitor for growth of heap for a particular job. If the heap owned by a job fills, this will result in MCH6903 F/#hmalcmi with an activation group mark that is not zero . See the following reference for additional details on this type of heap: Single Level Storage Heap Read More
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