What is the main difference between Subsystem & Activation Group

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Activation Groups
Subsystems
What is the basic difference between an activation group and a subsystem? I have tried reading couple of blogs but I get confused. Can anyone please help me with this?

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  • TomLiotta
    It might be easier to come up with a basic similarity than a basic difference.   If you think in terms of an outline, the whole outline is the whole system. A subsystem is one of the major outline topics. Within that are sub-topics that are jobs. And within each job are smaller sub-topics, activation groups.   A subsystem is a work management container for setting characteristics of the execution environment for jobs that run in it. It relates to a collection of jobs.   An activation group is a sub-unit of a single job. Resources that are accessed by the job can be isolated within an activation group. An activation group name is an attribute of a program.   Multiple programs can be called in a job, and programs that have the same activation group name will run in a smaller container together. They can share certain resources that aren't available to programs in a different activation group.   Resources within the group are released when the activation group ends.   Tom
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  • Splat
    Tom, that has to be one of the most elegant and concise explanations of iSeries work management I've come across.
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  • juslikdat1
    Thanks a lot Tom. You explained it very clearly.Sruthi
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  • TomLiotta
    The problem with the description is that it's too simple. It only gives a way to think about the structure of a relationship between the two. It doesn't take much work to see that a lot is left out. -- Tom
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