July 2003
Intermediate to advanced
206 pages
7h 41m
English
book
IMS in the Parallel Sysplex Volume II: Planning the IMSplex
by Jouko Jantti, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume II: Planning the IMSplex
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Chapter 3. Planning for block level data sharing 61
There is a general rule, however, that applies in most cases. Programs which run well in a
non-data sharing environment will probably run well when sharing data. Those that do not
run well will almost certainly not run well when sharing data. Part of the planning process
will be to try to identify any characteristics of the applications or databases which would
make them poor performers when migrated to a data sharing environment.
When you go from non-data sharing to data sharing, you will incur a measurable increase
in overhead for the change from local to global locking. However, once you ...
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