Memorex LOCK - VERSION 2-24 Informations techniques Page 56

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Scratching or Deleting Datasets
1-38 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Scratching or Deleting Datasets
Description BIM-EPIC provides several methods for scratching datasets. Datasets can
be scratched upon request using JCL, Online Manager, TSIDMNT, or
TSIDUTL. Regardless of which method you use, the BIM-EPIC scratch
process performs the same actions.
When BIM-EPIC scratches a disk dataset, three events occur:
BIM-EPIC deletes the VTOC entry.
The disk space is made available for reuse.
The DSN Catalog entry for that version is deleted.
For tapes that contain only one dataset, the tape volume is made eligible
for reuse immediately (scratched). For multi-dataset tapes, the tape
volume is not scratched until all of the datasets on it have been scratched.
The dataset version entry in the DSN Catalog is changed to scratch status;
however, the version entry is not deleted. If the BIM-EPIC dataset
definition (EDD) still exists, the scratched version record remains in the
DSN Catalog. When the tape is made eligible for reuse, a scratched
dataset can be retained or re-activated as a version.
For both tape and disk, only the version record is affected in normal
scratch processing. However, an EDD can be deleted from the DSN
Catalog using the DELETE function or the PURGE function.
DELETE scratches all versions and VTOC entries but does not
remove tape volumes from the DSN Catalog.
PURGE scratches all versions and VTOC entries and removes
tape volumes from the DSN Catalog.
When deleting (not purging) a tape version, the record is moved to the
definition name ** DSN DELETED **.
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