Memorex LOCK - VERSION 2-24 Especificações Página 230

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Reusing the Same Space Disk Processing
7-10 User Reference
Reusing the Same Space
DSN Catalog
If you want to write a new version of a disk dataset in the same location (reusing the same
space), catalog the dataset as work ("WRK" using Online Manager, or WRK=YES using
TSIDMNT) and zero secondary allocations.
1. Each time the dataset is created or modified, inhibit truncation. This leaves space in the
extent for a larger dataset the next time it is processed. To inhibit truncation with a DLBL,
specify the "N" option in the dataset name; with a DD statement, use the SPACE parameter.
2. Each time the dataset is modified, you must indicate that you want to reuse the same space.
With a DLBL, specify option "S"; with a DD statement, specify DISP=(MOD,KEEP).
// DLBL OUTPUT,'DATA.FILE,(N,S)'
* //OUTPUT DD DSN=DATA.FILE,UNIT=DISK,
* // DISP=(MOD,KEEP),SPACE=(TRK,0)
JCL Requirements
Examples
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