Object ID including physical storage information, compared with traversing JDO Object in JDO environment Object, so the method can cut down the time for accessing to disk in case index filter factor is smaller.

• 由于对象ID包含实例的物理存储信息,相对于JDO环境对象遍历的查询方式,该方法在索引过滤因子较小的情况下,能节省磁盘的访问时间。