COMPRESS


>>-+------------+----------------------------------------------><
   +-COMPRESS---+   
   '-HWCOMPRESS-'

COMPRESS specifies that the dumped data is to be written in compressed form to the output medium. This decreases the space occupied by the dump data at the expense of increased processor and elapsed times.

Note:

The COMPRESS keyword is ignored if it is specified during a logical data set dump for either compressed-format sequential data sets or compressed-format VSAM data sets.
If you have a tape drive with the compaction feature and you want to use hardware data compaction, you do not need to specify the COMPRESS keyword. If software data compression is desired, you do not need to specify DCB=TRTCH=COMP in the JCL. However, you may specify both the COMPRESS keyword and DCB=TRTCH=COMP.
If you want to use compressed format sequential data sets on DASD, you do not need to specify the COMPRESS keyword. To obtain software data compression, you do not need to use a compressed format sequential data set on DASD. However, you may specify both the COMPRESS keyword and a data class on the output DD that requests compressed format sequential data sets.
To improve performance and save dump space, specify the OPTIMIZE keyword with the COMPRESS keyword.