in reply to Cookies or maybe another way to do it.....

your UPDATE statement look wrong to me, it updates all visites fields in the table logs. 
if ( $ENV{HTTP_COOKIE} ) {
 $dbh->do(q{ 
      UPDATE logs SET visits = visits + 1 WHERE host = ? },
      {}, $host );
}

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Boris

In Section Seekers of Perl Wisdom