Decollating Directly from CDAM

Output retrieval directly from CDAM compressed sysouts is performed for jobs that write the reports directly to CDAM datasets, bypassing the system spool.

Figure 4 Decollating Directly from CDAM

This technique requires only minor JCL changes and provides many advantages. Listed below are several advantages of the CDAM technique:

• The reports are written directly to compressed sysout; they do not pass through the system spool. Consequently, redundant read and write operations are eliminated and computer resources are conserved.
• The elapsed time for jobs that create large reports is reduced by 10% or more.
• The CDAM facility performs report compression. Depending on the type of data compressed, the compression rate is 30% – 70%. A significant amount of disk space is saved by this process.
• Regular conventional security methods (for example, RACF, ACF2, TOP-SECRET) protect CDAM sysout (datasets).
• The risk of 100% spool utilization is considerably reduced because the spool is minimally utilized.
• There is no danger of SB37 abends due to insufficient disk space (for the compressed sysout).

AFP users can also specify PAGEDEF and FORMDEF parameters in the DD statement and not in the OUTPUT statement.