
BIM-EPIC Dataset Definition Components
User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
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WARNING:
Encrypted dataset versions must not be deleted from the DSN
Catalog. Once a dataset version is deleted, its data cannot be
decoded, making the dataset version is unreadable. In addition,
once the dataset is cataloged, the encryption password cannot
be added, changed, or deleted.
User ID and
System ID
User ID and system ID assist in grouping tape datasets for reporting and
scratching purposes. Each ID can contain any two-character code that is
significant to you or your installation. There is no difference in how the
IDs function. You can use either or both the user ID and system ID to
group datasets at the various levels.
SYS Number You can specify a specific SYS number to use for a dataset by entering
the SYS number in the dataset definition. This inhibits the BIM-EPIC
Logical Unit Block (LUB) allocation for the dataset each time the dataset
is processed. You should avoid specifying a SYS number unless it is
absolutely necessary. You can allow the BIM-EPIC LUB Allocation
feature to assign a SYS number for you or you can inhibit LUB allocation
through JCL. If you choose to assign a SYS number in the dataset
definition, do not use the same number for a different dataset in the same
job step in your JCL.
Block Size Block size reblocks datasets and overrides any block size coded in the
program file definition. If the block size specified is not a multiple of the
record length, BIM-EPIC automatically rounds down to the closest
multiple.
Reblocking is valid only for sequential datasets with fixed or variable
record formats. In addition, the program must specify fixed or variable
length record formats in its file definition coding. Reblocking is
supported for all datasets processed by logical input/output control
services (LIOCS), but may be ignored by programs that use physical
PIOCS to process the dataset. Reblocking is not valid for tape datasets
which will be read backward.
Block size and CISIZE are mutually exclusive. You can specify only one,
either the block size or CISIZE, in an BIM-EPIC dataset definition.
Generation or
Work Dataset
BIM-EPIC provides four retention criteria: generation or work, retention
days, and date after last access (DLA) retention. All of the criteria work
together to determine retention for active versions.
The generation or work field specifies whether to keep more than one
version of the dataset at a time. When you designate a dataset as a
generation dataset, BIM-EPIC maintains at least the number of versions
specified in the Cycles Retention field. Because each version is also
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