Some of the advantages to using PDSEs are as follows:
- PDSEs support member-level DDM attributes, whereas member-level
attributes do not exist for PDSs.
- PDSE members can contain stream files, whereas PDS members cannot.
However, you can use stream access to PDS members that contain record
files.
- PDSEs use dynamic space allocation and reclamation, whereas PDSs
need to be compressed periodically with the IEBCOPY utility.
- PDSEs are always SMS-managed. PDSs are not necessarily SMS-managed.