Did you look at the file afterward to see if it actually had new data appended to it?
Always ALWAYS check for success/failure of your opens. It's easy....
open(OUT, ">>$sql_file") or die "Guess what, it didn't work!\n$!";
If I had to guess, I'd say that your script doesn't have proper permissions with the file you're trying to write to and open.
To answer your second question, you can say, " no warnings qw/vars/; " in the appropriate section of code, and then restart them later. The warnings pragma gives pretty good flexibility.
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