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They say that everything can be found in the last place you look. It
wasn't the scatter-gather; it was a failed update.
As it happens, I hadn't checked the job log for duplicate key collisions
on the update. When I did, I found that every affected record had one,
on a logical that was uniquely keyed on a generated key field that was
regenerated in my program.
This particular key was designed, at least in part, to enforce
uniqueness on the records. And some outside program writing and/or
updating the file had been modifying that generated key in order to
subvert the enforced uniqueness.
--
JHHL
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