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  1. or download this
    #Generated tnsnames.ora by gen_tnsnames.sh script
#Localnode service connectivity 
...
      (SERVICE_NAME = ABCD12.COMPANYDOMAIN.COM) 
    )
  )
  2. or download this
    use DBI;
use DBD::Oracle qw(:ora_session_modes);
...
$ENV{ORACLE_SID} = "ABCD12.COMPANYDOMAIN.COM";
delete $ENV{TWO_TASK};
my $dbh = DBI->connect($dsn, "", "", { ora_session_mode => ORA_SYSDBA 
+});
  3. or download this
    DBI connect('','',...) failed: ORA-12545: Connect failed because targe
+t host or object does not exist (DBD ERROR: OCIServerAttach)