March 2003
Intermediate to advanced
282 pages
9h 13m
English
book
IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
by Jouko Jantti, Juan Jesœs Iniesta Mart’nez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
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Chapter 1. Introduction to the Parallel Sysplex 23
Figure 1-12 Managing IRLM failures
Lock structure sizing considerations
Locking services will work no matter how big the lock table is, but if there are a lot of false
contentions, then there will be a lot of additional overhead to resolve the potential conflict.
Ideally we would like to have no potential contentions, but since this is not really possible, we
would at least like it to be a very, very small probability. Therefore, the size of the structure
and the size of the lock table should be big enough to keep this probability low. A lock table
entry may require two, four, or eight bytes, ...
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