March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
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214 Introduction to the New Mainframe: z/VSE Basics
systems against the same data and then compare the results. If after a certain
period of time we are satisfied with the results, we switch to the new application.
If we discover problems, we can correct them and continue the parallel run until
there are no longer any new problems.
In other cases, we deal with a new system, and we might have a cut-over day
when we start using it. Even in the case of a new system, we are usually
replacing some form of system, even if it is a manual system, so we could still do
a parallel test if we wanted to.
Whichever method is used to go into production, there are still all of the loose
ends that need to be taken care of before we hand the system over to operations ...
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