The relative record number is used to retrieve the logical record from the data set. 使用相对记录号可以从数据集中检索出相应的逻辑记录。
While we won't discuss the details, in either case it is still possible to develop a simple algorithm to compute a record's physical location, given its relative record number. 虽然我们不考虑这些细节,但以上两种情况给定了它的相对记录编号,开发一种计算记录物理位置的算法仍然是可能的。