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Disk work storage devices z/OS DFSORT Application Programming Guide SC23-6878-00 |
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Program performance is improved if you use devices, storage areas,
and channels efficiently. If you specify a particular device type
with the UNIT parameter on the DD statements that define intermediate
storage data sets (for example, UNIT=3390), DFSORT assigns areas,
and some optimization occurs automatically. You can get the best performance
using disk intermediate storage devices when you:
Elapsed time is decreased when DFSORT can both read input while writing to SORTWKdd and write output while reading from SORTWKdd. If, for example, you have two channels, the best allocation of them is to have SORTIN, SORTOUT, and OUTFIL data sets on one and the SORTWKdd data sets on the other. Storage requirements for different disk techniques can be estimated by using the guidelines found in Using work space. |
Copyright IBM Corporation 1990, 2014
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