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CA Compress provides real-time application data compression and expansion support using SVC intercepts and the MVS Subsystem interface. Data sets requiring data compression support are registered in the Compress Control File. As data sets are opened by the application programs, the Control File is checked to see if and how a data set is to be supported. As data is read and written by the application program it is expanded and compressed as needed. Compression and expansion support services are completely transparent to your application programs. CA Compress occupies both user and system address space for these services.
The following figure illustrates how CA Compress works.
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