Yiiboilerplate - How To Enable Logging (Incl Db)

Whats the proper way to enable logging in Yii Boilerplate? I tried adding the following log code in main.php without any success.

            'components' => array(

                     'log'=>array(


                                  'class'=>'CLogRouter',


                                  'routes'=>array(


                                                  array(


                                                        'class'=>'CFileLogRoute',


                                                        'logFile'=>'test.log',


                                                        'levels'=>'trace, info, error, warning',


                                                       ),


                                                  )),

                 );

Does logging support need to be put in the frontend / backend, or is there a more global logging configuration? Does this include database queries?

Thanks,

James