mje, here is my code after following your suggestions.

sub upload
{
        my ($csv_file, $table, $col1, $col2, $col3) = ($_[0], $_[1], $
+_[2], $_[3], $_[4]);

        my $csv = Text::CSV->new ( { binary => 1 } ) or die "Cannot us
+e CSV: ".Text::CSV->error_diag ();
        open my $fh, "<:encoding(utf8)", $csv_file or die " $!";
        <$fh>; ### this is to remove the column headers.

        my $dbh = DBI->connect ("dbi:Oracle:host=<hostname>t;sid=SID;p
+ort=1526", 'username', 'password',
                                { RaiseError => 1, AutoCommit => 1, Tr
+aceLevel => 0 })
                                or die "Cannot create Database Handle:
+ $DBI::errstr()";

        my $sth = $dbh->prepare ("INSERT INTO $table ($col1, $col2, $c
+ol3) VALUES (?,?,?)");

        while ( my $row = $csv->getline ($fh))
        {
                $sth->execute ($row->[0], $row->[1], $row->[2]);
        }

        $sth->finish();
        $dbh->disconnect();
        close $fh;
}
[download]

Thank you very much for guiding me.