This paper introduces the principles, methods and procedures in the highly efficient realization of the backupand restori1tioll of arbitrary-sized database files by employing ARJ software tool, supplemented by low-level files operation mode.

• 文章介绍利用ARJ软件作为工具，辅之以低级文件操作方式，高效实现任意大数据库文件的备份与恢复的原理、方法和步骤。