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Multi-Dataset Processing Processing Tape Datasets

7-16 User Reference

If you are creating subdatasets with a single program that opens multiple DTFs with different

logical units, you must inhibit LUB allocation through the DSN Catalog. To force BIM-EPIC

to use the same logical unit for each dataset, specify the same SYS number in each EDD.

If you are creating subdatasets with different programs using DTFs with different logical units,

you can use a VSE // ASSGN statement to assign the SYS number from the previous step to

the SYS number in the current step. This may be necessary when using different utility

programs to create subdatasets with different SYS numbers.

2. BIM-EPIC corrects the file sequence number on your TLBL, if it is incorrect. You may

omit the file sequence number.

3. If your program uses multiple open requests for the same DTF name, you must specify

TLBL option 16 (dataset drop). Dataset drop is automatic when you use multiple DD

statementswith the same ddname.

4. Prevent rewind on close for each dataset processed except the last. This can be

accomplished with any of the following:

• option code "3" in a TLBL statement

• VOL=(,RETAIN) in a DD statement

• OPT=NOREW in a DD statement

For the last dataset, you may want to specify a rewind or unload option code. Rewind can be

accomplished with either of the following:

•

option "1" (rewind) in a TLBL statement

• FREE=CLOSE (rewind) in a DD statement

• Unload can be accomplished with either of the following:

• option "2" (unload) in a TLBL statement

•

VOL=(PRIVATE) (unload) in a DD statement

5. For each dataset processed except the last, prevent the release of assignment. This can be

accomplished with either of the following:

•

option "8" in a TLBL statement

• FREE=END in a DD statement

For the last dataset, you usually want the assignment to be released at close. This can be

accomplished by omitting the option code.

6. On output, BIM-EPIC continues to write new datasets at the end of the current multi-

dataset group. When you want to create a new group, you must start by creating a new version

of the prime dataset.

7. On input, you can process the datasets in any order. Because of the physical limitations of

tape media, it is most efficient to process the datasets in ascending order by file sequence

number, but this is not mandatory.

8. To automatically catalog a subdataset, you must use DD statements.

If the length of the prime dataset name is 17 characters or less, the prime dataset name is

entered in the Comment field of the subdataset EDD. If the prime dataset name in the

comment field is longer than 17 characters, BIM-EPIC puts XXXXXXXXXXXXXXXXX in

the subdataset's Comment field.

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