If you have enough memory that you can slurp the files into arrays, you might consider slurping them into hashes instead. Then checking if a number is on the list will be very fast, I.E. 
if( $do_not_call{ $test_number } ){
    print "Do Not Call $test_number\n";
}

[download]
As far as database options, you might consider DBD::SQLite. It's very fast.

In reply to Re: Searching text files by duckyd
in thread Searching text files by SteveS832001

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