'class' => 'yii\db\Connection',
'dsn' => 'oci:dbname=//******/TEST;charset=AL32UTF8',
'username' => '******',
'password' => '******',

// Schema cache options (for production environment)
'enableSchemaCache' => true,
'schemaCacheDuration' => 3600,
'schemaCache' => 'cache',
'attributes' => array(PDO::ATTR_CASE => PDO::CASE_UPPER),
'enableLogging' => true,
'schemaMap' => [
    'oci'=> [
      'class'=>'yii\db\oci\Schema',
      'defaultSchema' => 'RBT', //specify your schema here
    ],
],