Exclusion Facility

Excluding certain jobs, modules, and programs from CA Compress processing improves performance by reducing both I/O and CPU time. More importantly, exclusion can prevent programs from compressing already compressed data.

The CA Compress Exclusion Facility is controlled by a sequential data set or a member of a PDS that is pointed to by the SYSIN DD of the CA Compress started task. The DCB attributes of the file are LRECL=80, RECFM=FB, and any BLKSIZE equal to a multiple of 80. It contains definition statements for the CA Compress address space. The statements include nine table names and their associated record entries.

The tables include the names of jobs, programs, and modules for which CA Compress processing should not take place. If a job, program, or module name is in these tables, GET for a Compress data set retrieves compressed data, and a PUT stores the record as is, without compression.

This section contains the following topics:

Exclusion for VSAM Backup/Restore Processing

Exclusion for Physical Sequential Transparency Processing

Exclusion to Prevent Control-Interval (CI) Processing and EXCP

The Exclude File

Expiration Date of 86060

Exclusion by DDNAME @ZSM@XCL

Invoking Exclusion in Assembler Macros