Instead of

my $count1 = 0;    # Total number of keys in a table
my $count2 = 0;    # Matched + Undefined + Ingonerd values for key
my $count3 = 0;    # Number of keys exactly matched
[download]

better names might be $nKeysInTable, $nValsMUI, $nKeysMatchedExactly, its self-documenting code :)

Also, see Re: Formats and Variable Scope for how to make your formats easier to use by making them functions , and eliminating all those format variables.