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Physical Sequential Transparency

The Physical Sequential Transparency (PST) supports compression and expansion of Physical Sequential data sets without application program or JCL changes. As in the case of VSAM data sets, the user defines selected PS data sets or patterns in the CA Compress Control File using the Interactive User Interface or Control File Maintenance Utility. CA Compress automatically intercepts activity against appropriate data sets in order to write compressed data to the compressed data sets and return uncompressed data from them to application programs.

This section contains the following topics:

Full Transparency to Application Programs

Full Interactive User Interface and Control File Maintenance Utility

Compatibility with Previous Releases and the SUBSYS JCL Parameter

Implementation Considerations

Implementing Uncompressed Data Sets with the IUI

Implementing Compressed Data Sets with the IUI

Limitations and Restrictions