Exclusion Facility › Exclusion for Physical Sequential Transparency Processing

Exclusion for Physical Sequential Transparency Processing

For similar reasons, the EXCLUDE-JOB-PST, EXCLUDE-PGM-PST, and EXCLUDE-MOD-PST tables prevent compression and expansion of PST data sets. For instance, it is not uncommon to sort or select certain compressed records based on uncompressed fields, without actually expanding them. In such cases, processing uncompressed not only adds overhead, but forces SORT control cards to change.

Because the exclusion facility causes compressed data sets to be processed without CA Compress, be sure when coding DCB parameters that you specify the compressed attributes. Otherwise, CA Compress does not realize that the data set is compressed, and other errors can occur.