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my $dbh = DBI->connect("dbi:mysql:db", "user", "pass",
              { AutoCommit => 1, RaiseError => 1})
...
my $qry = $dbh->prepare("SELECT location FROM people")
                or die &error_out;  
$qry->execute or die &error_out;

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$qry->give_me_the_size_of_the_resultset; ?  :)