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Use the DEFINE GENERATIONDATAGROUP command. In the same
IDCAMS step, another dataset must be defined whose DCB
parameters are used when new generations of the GDG are
created. This dataset is known as the model dataset. The ds
name of this model dataset must be the same as that of the
GDG, so use a disp of keep rather than catlg and also
specify space=(trk,
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