$dbhost = ‘192.168.0.15’;    //IP of my host database
$dbport = ‘1521’;    //Oracle port
$dbname= ‘MY_ORCL’;    //My database Name

$dbConnString = “
  (DESCRIPTION =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = “. $dbhost .”)(PORT = “. $dbport .”))
  )
  (CONNECT_DATA =
    (SERVICE_NAME = “. $dbname .”)
  ))
“;
//————————————————————————————————————————

$active_group = “default”;

$db[‘default’][‘hostname’] = $dbConnString;
$db[‘default’][‘username’] = “MY_USER”;
$db[‘default’][‘password’] = “MY_PASSWORD”;
$db[‘default’][‘database’] = “”;
$db[‘default’][‘dbdriver’] = “oci8”;
$db[‘default’][‘dbprefix’] = “”;
$db[‘default’][‘active_r’] = TRUE;
$db[‘default’][‘pconnect’] = TRUE;
$db[‘default’][‘db_debug’] = TRUE;
$db[‘default’][‘cache_on’] = FALSE;
$db[‘default’][‘cachedir’] = “”;

$dbConnString = "
 (DESCRIPTION =
 (ADDRESS_LIST =
   (ADDRESS = (PROTOCOL = TCP)(HOST = ".$dbhost.")(PORT = ".$dbport."))
 ) 
 (CONNECT_DATA =
     (SID = ORCL)
  (SERVICE_NAME = ".$dbname.")
 ))";

$db['oracle']['hostname'] = $dbConnString;
$db['oracle']['username'] = "username";    
$db['oracle']['password'] = "password";   
$db['oracle']['database'] = "";
$db['oracle']['dbdriver'] = "oci8";   
$db['oracle']['dbprefix'] = "";
$db['oracle']['pconnect'] = TRUE;
$db['oracle']['db_debug'] = TRUE;
$db['oracle']['cache_on'] = FALSE;
$db['oracle']['cachedir'] = "";
$db['oracle']['char_set'] = "utf8";
$db['oracle']['dbcollat'] = "utf8_general_ci";

이렇게 작업하고..
 $dbOrg = $this->load->database("oracle",TRUE);

  $query = $dbOrg->query('select sysdate as d from dual;');
  $row = $query->row();
  echo $row->d;

  $dbOrg->close();

이렇게 해보았는데 연동이 안됩니다.
oracle 말고 mysql에서는 2개의 db로 처리하는 것이 되었는데..
여기는 왜 그럴까요?