$ORACLE_HOME/bin/sqlplus uname@ihr-live/password

##</code><code>##

$ENV{'ORACLE_HOME'} = '/path/to/oracle';
$ENV{'ORACLE_SID'}  = 'IHRLIVE';
$dbh = DBI->connect('DBI:Oracle:', $uname, $password,
                    {
                    PrintError => 0,
                    RaiseError => 0
                    });