Memorex LOCK - VERSION 2-24 Dokumentacja Strona 49

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The BIM-EPIC Environment What Happens When BIM-EPIC Scratches or Deletes a Dataset?
Chapter 1. Introduction 1-35
What Happens When BIM-EPIC Scratches or Deletes a Dataset?
BIM-EPIC provides several methods for scratching datasets. Datasets can be scratched at
your request using JCL, Online Manager, the TSIDMNT catalog management utility, or the
TSIDUTL catalog maintenance utility. Regardless of which method is used, BIM-EPIC
scratch processing is the same.
When BIM-EPIC scratches a disk dataset, it deletes the VTOC entry, and that disk space is
made available for reuse. The DSN Catalog entry for that version is deleted.
For tapes containing only one dataset, the tape is made eligible for scratch immediately. For
multi-dataset tapes, the tape will not be scratched until all its datasets have been scratched.
The dataset’s version entry in the DSN Catalog is changed to scratch status; it is not deleted.
If the dataset’s definition (EDD) still exists, the scratched version record remains in the DSN
Catalog. If the dataset definition is deleted, the tape version record is moved to the definition
name
‘** DSN DELETED **’.
For both tape and disk, only the version record is affected in normal scratch processing.
However, dataset definitions can also be deleted from the DSN Catalog with the DELETE and
PURGE functions. 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.
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