
Retaining Dataset
1-24 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Retaining Dataset
Description The retention rules for cataloged datasets are:
Tapes are not made available for reuse and disk space is not
released until dataset versions are scratched.
Non-temporary versions are not scratched until the TSIDUTL
SCRATCH function is executed. Versions are not scratched
unless they meet eligibility criteria. A version is not eligible to be
scratched until ALL the retention criteria have been satisfied.
Any version can be scratched at any time using Online Manager
or TSIDMNT SCRATCH. When a new work dataset version is
opened, the previous work dataset version is scratched
immediately.
Work dataset versions opened as input can be scratched at close
or at end-of-job or job step. JCL parameters are available to
instruct BIM-EPIC to scratch disk versions, free space, and erase
the entry from the VTOC. Tapes become available for reuse as
output.
Multi-dataset tape volumes are not made available for reuse until
all dataset versions on the tape have been scratched.
Conditionally cataloged versions can be scratched the day after
they are created.
Common work dataset versions are always scratched at
end-of-job.
Open versions can be scratched based on settings in the
THLDOPEN parameters and DHLDOPEN parameters of the
TSIDUTL SCRATCH function. The default is to retain open tape
versions for one day and open disk versions for two days after
their creation dates.
!
WARNING:
Tapes in open status can be reused before they are scratched.
These tapes are accepted as scratch tapes if they are accessed
in the same partition with a different job name. While this means
that the tape is vulnerable to accidental reuse, it also means that
the tape is immediately available as scratch. You can use special
EPS configuration options to modify this setting.
The following provides examples of retention when using multiple
criteria.
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