The way that I have traditionally approached this problem is thusly: the ruling logic is the while-loop as written, and the exception to that loop is “100 records at a time.”
Therefore, I would first precede that loop by initializing a counter:
my $records_so_far = 0;
Then, within that loop (at the bottom) I would add, e.g.: if ($records_so_far ++ >= 100) {
$records_so_far = 0;
<<do something interesting here>>
}
... and then, after the loop(!) ...
if ($records_so_far > 0) <<do it again i.e. call the same subroutine>>
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