public function deleteMany($keys)
    {
        $cacheKeys = [];
        foreach ($keys as $key) {
            $cacheKeys[] = $this->_key($key);
        }

        $success = $this->_Memcached->deleteMulti($cacheKeys);

        $return = [];
        foreach ($keys as $key) {
            $return[$key] = $success;
        }

        return $return;
    }