如果在Access数据库(Access项目)中删除数据或对象，则数据库可能会变成碎片保存，并会降低磁盘空间的使用效率。压缩数据库可以备份数据库，并重新安排数据库文件在磁盘中保存的位置。-If the Access database (Access Project) to delete data or objects, then the database may become fragmented preservation, and will reduce the efficiency in the use of disk space. Compressed database backup database, and re-arranged database file saved on disk position.