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 4. Additional data sharing facilities 79
– Data items will be read from the cache instead of DASD.
The calculation of how large a portion of the cache structure to allocate for the data elements
is based on how much data you want in the cache.
The size of the OSAM structure is calculated as shown in Figure 4-1.
Figure 4-1 Example of OSAM structure sizing
4.1.4 Requesting data caching
Several parameters are necessary to invoke OSAM DB CF caching:
In the IOBF subpool definition statement in DFSVSMxx, there is a caching option
parameter CO, which can be set to:
N = No data caching for this subpool.
A = Cache all data when read from DASD and all ...
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