The problem is that hash references (what {}
returns) are local to the process that created
them.
So when you save those references in your dbm,
they're only going to be valid for the current
process, and won't work when your program runs
again.
The other problem is that every time you create a
new key, you're overwriting your whole hash.
# your else clause, rewritten
%{$hitsdb->{$page}->{$key}}={
'year' => $Year,
'month' => $Month,
'day' => $month_day,
'referer' => $referer,
'counter' => 1
};
print "new instance";
Otherwise, you wipe out all the old data every time
you add a new key. You've got the same problem
in your other else branch, which you don't
really need, since adding a new instance will
auto-vivify the page if it's not already there.
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