$this->paginate = array(
                'conditions'    => $conditions,
                'limit'         => 20,
            );

$this->paginate = array(
                        'conditions'    => $conditions,
                    //    'limit'  => 20
                    );

$this->paginate = array(
                        'conditions'    => $conditions,
                        'limit'     => 100,
                        'maxLimit'  => 10000
                    );

$all = $this->ModelName->find('count', array('conditions'=> $conditions));

$alldata = $this->ModelName->find('all', array('conditions'=> $conditions, 'limit' => $all));