SUBSYS DD Parameter

SUBSYS DD Parameter

CA Compress provides the following two ways to invoke data set compression using the CA Compress subsystem:

• Automatic (transparent) compression of VSAM or physical sequential data sets using the CA Compress Transparency. This is the preferred method.
• Manually invoked compression of non-VSAM data sets by coding the SUBSYS parameter on DD statements in your JCL (or using dynamic allocation). Using the SUBSYS parameter with VSAM data sets causes OPEN to fail with an 0C4 (IBM APAR OW10331) due to a missing DEB extension.

This section contains the following topics:

How it Works

Coding the SUBSYS JCL Parameter

Special Considerations When Using SUBSYS