private static function __logActivity($config, $type, $key, $success, $startTime) {
		$queryTime = round((microtime(true) - $startTime) * 1000, 2);
		self::$_logs[$config][] = array(
			'type' => $type,
			'key' => $key,
			'success' => $success,
			'time' => $queryTime
		);

		self::$_queriesTime += $queryTime;

		if (count(self::$_logs[$config]) > self::$_maxLogs) {
			array_shift(self::$_logs[$config]);
		}
	}