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Types of Datasets Common Work Datasets (CWDS)
Chapter 7. Running Jobs With BIM-EPIC 7-31
Common Work Datasets (CWDS)
The easiest way to control sort work, compiler work areas and any other disk only dataset that
does not need to be kept after end-of-job is to use the common work dataset (CWDS) feature.
When a dataset name begins with three dollar signs and a period ($$$., or £££. in the U.K.),
BIM-EPIC recognizes it as a CWDS. The $$$ (or £££) in the dataset name are replaced by
the CPU ID and partition ID in which the job is executed. This substitution is the reverse of
"===" datasets, to avoid any conflicts if both are used with the same dataset name. In
addition, a CWDS is automatically deleted at end-of-job, even if the job cancels.
Since each version is deleted at the end of every job, no versions are recorded in the DSN
Catalog or kept on disk. If you attempt to open a version as input in a new job, the job cancels
with an appropriate error message.
CWDS requires that you catalog only one dataset name, unlike CPU/partition independence
which requires you to catalog a partition/CPU independent dataset name for every partition
and machine combination in which the dataset could be used.
1. Catalog the dataset name beginning with '$$$.' ('£££.' in the U.K.). Use the remaining 40
characters to name the dataset.
2. Specify as work ("WRK" using Online Manager, or WRK=YES using TSIDMNT).
3. Cycle, retention period, and DLA retention are ignored if you specify them.
This control statement catalogs a CWDS using TSIDMNT.
CAT '$$$.SORTWK1',WRK=YES,POL=POOL01,EXT=120
Specify the dataset name beginning with '$$$' ('£££'. in the U.K.). No delete options are
necessary on the dataset's DLBL or DD statement.
Description
DSN Catalog
Example
JCL Requirements
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