The $dbh->prepare is in a loop, with the same statement and
handle attributes. You only need to prepare it once:
my $sth2 = $dbh->prepare_cached("select d_id, c_id from d
where d_id = ?");
$sth2->execute( $did2 );
# And since you need less clutter on the monitor
(my $sth2 = $dbh->prepare_cached(<<"")) -> execute ($did2);
select d_id, c_id from d where d_id = ?
# line above intentionally left blank
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