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Generation data set (GDG) bias numbers must be adjusted so that the relative references to them within the restarted job refer to the correct generation of the data set.
For example, adjusting GDG bias numbers enables a job that creates data set A.B(+1) in STEP1 and reads A.B(+1) in STEP2 to be successfully restarted in STEP2 without manually changing the JCL relative generation number from +1 to 0.
Because it works completely automatically, the GDG Adjustment facility allows the user to restart jobs without being concerned about the technical details of GDG maintenance.
Because Control-M/Restart can handle jobs that dynamically allocate GDG data sets, but does not perform adjustments for such data sets, it may be necessary to exclude dynamically allocated GDG files from Control-M/Restart processing when these files are referenced both through JCL and by dynamic allocation.
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