$database = "BLUDB";
$user = "dashdb_user";
$password = "dashdb_passwd";
$hostname = "dashdb_host";
$port = 50000;

return array(
    'db' => array(
        'driver'         => 'Pdo',
        'dsn'            => 'mysql:dbname=mysql_db;host=localhost',
        'driver_options' => array(
            PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES 'UTF8''
        ),
        'adapters'=>array(
            'db2' => array(
                'driver'         => 'IbmDb2',
                'database' => "DRIVER = { IBM DB2 ODBC DRIVER }; DATABASE = $database; HOSTNAME=$hostname; PORT = $port; PROTOCOL = TCPIP ; UID = $user ; PWD = $password;",
            ),
        )
    ),

return array(
    'db' => array(
        // for primary db adapter that called
        // by $sm->get('ZendDbAdapterAdapter')
        'username' => 'mysql_username',
        'password' => mysql_passwd',

        // to allow other adapter to be called by
        // $sm->get('db1') based on the adapters config.
        'adapters' => array(
            'db2' => array(
                'username' => 'dashdb_user',
                'password' => 'dashdb_passwd',
            ),
        ),
    ),
);

public function onBootstrap(MvcEvent $e)
{
    $eventManager        = $e->getApplication()->getEventManager();
    $moduleRouteListener = new ModuleRouteListener();
    $moduleRouteListener->attach($eventManager);

    $sm = $e->getApplication()->getServiceManager();
    $sm->get('db2');
}

( ! ) Fatal error: Uncaught ZendDbAdapterExceptionRuntimeException: The ibm_db2 extension is required by this driver. in F:wampwwwplaydon_websitevendorzendframeworkzend-servicemanagersrcServiceManager.php on line 1130
( ! ) ZendServiceManagerExceptionServiceNotCreatedException: An abstract factory could not create an instance of db2(alias: db2). in F:wampwwwplaydon_websitevendorzendframeworkzend-servicemanagersrcServiceManager.php on line 1130
Call Stack
#   Time    Memory  Function    Location
1   0.0303  357304  {main}( )   ...index.php:0
2   0.5798  867056  ZendMvcApplication::init( )   ...index.php:17
3   3.4846  3664936 ZendMvcApplication->bootstrap( )  ...Application.php:281
4   3.8506  4129480 ZendEventManagerEventManager->triggerEvent( ) ...Application.php:169
5   3.8506  4129480 ZendEventManagerEventManager->triggerListeners( ) ...EventManager.php:251
6   4.3917  4660464 call_user_func:{F:wampwwwplaydon_websitevendorzendframeworkzend-eventmanagersrcEventManager.php:490} ( )    ...EventManager.php:490
7   4.3917  4660464 ApplicationModule->onBootstrap( )  ...EventManager.php:490
8   4.4072  4670080 ZendServiceManagerServiceManager->get( )  ...Module.php:33
9   4.4073  4670600 ZendServiceManagerServiceManager->create( )   ...ServiceManager.php:530
10  4.4073  4670600 ZendServiceManagerServiceManager->doCreate( ) ...ServiceManager.php:597
11  4.4073  4670600 ZendServiceManagerServiceManager->createFromAbstractFactory( )