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VSAM Demystified by Valeria Sokal, Alvaro Salla, Jose Dovidauskas, Mary Lovelace

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Miscellaneous performance items
This appendix addresses the lab environment that was used for the measurements throughout the book. It also provides a general discussion on caching, common error messages that indicate broken data sets, and output from the EXAMINE command.
This appendix contains the following sections:
 
DASD cache concepts
A cache is fast storage (no mechanical movement) in the DASD controller ...

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