DBM::Deep is an ideal solution for this problem. Building the DBM file might take a little time, but lookups would be pretty quick. And, it's about as simple an implementation as you could want. 
my $db = DBM::Deep->new( $filename );

print "$db->{32}\n"; # prints 14456

[download]
My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re: fast lookups in files by dragonchild
in thread fast lookups in files by citromatik

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