...
my $data_file = "data.tsv";

my $s2 = "\copy (" . $tableName . ") FROM '" . $data_file . "'";
$dbh->do($s2);
...

##</code><code>##

DBD::Pg::db do failed: ERROR:  syntax error at or near ""
LINE 1: py (testingtable) FROM 'data.tsv'
        ^ at ./dbcopy.pl line 48.