Our test environment
We ran a few experiments to clarify some performance and usability aspects of VSAM. However, it happened in a non-controlled environment, where we cannot guarantee the same level of multiprogramming, and the same load in our DASD controller. Nevertheless, the results are sound, if you take into consideration such variables as number of EXCPs, I/O Connect time, and CPU time to compare the runs.
The jobs are totally I/O bound due to read-and-forget and write-from-thin-air.
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