(1) A VSAM data set whose records are physically in the same order in which they were put in the data set. A VSAM data set is processed by using addressed direct access or addressed sequential access and has no index. New records are added at the end of the data set.
(2) A data set whose records are loaded without respect to their contents, and whose relative byte addresses cannot change. Records are retrieved and stored by addressed access, and new records are added at the end of the data set.