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RRN is an *absolutely reliable* way to reference a specific record,
regardless of the presence or absence of a unique key . . . so long as
*you* have the file *open.*
If the file isn't open in *your* job, then the prudent thing to do is to
treat RRNs as an "all bets are off" situation, given that *any* user
with sufficient authority can do a RGZPFM on *any* file, at *any* time,
so long as he or she can get an exclusive lock on it.
--
JHHL
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