my $message= "This message should not appear";
my $exitcode= $UNKNOWN;
eval {
	my $dbh = undef;
	my $sth = undef;
	local $SIG{ALRM} = sub {
		if ($sth) {
			$sth->cancel();
		}
		die $timeoutstr;
	};
	alarm $timeout;

	$dbh = DBI->connect("dbi:Oracle:$sid", $user, $pass,
						 { AutoCommit => 0, RaiseError => 0, PrintError => 1 } );
	$sth = $dbh->prepare($stm) or do_exit($UNKNOWN, $dbh->errstr);
	$sth->execute() or do_exit($UNKNOWN, $dbh->errstr);
	if(my @row = $sth->fetchrow()) {
		# ...
	}
	else {
		$exitcode= $UNKNOWN;
		$message= "Did not get a result: " . ($DBI::errstr || '');
	}
	$sth->finish();
	$dbh->disconnect();
	alarm 0;
};
if ($@ and $@ eq $timeoutstr) {
	do_exit($CRITICAL, "Timeout after $timeout sec\n");
}