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 83
Figure 4-6 OSAM cache read and update data: diagram 5
The most important point to emphasize from this example is that IMSB did not have to access
DASD to obtain the updated block G*. Instead, it was able to obtain the latest version of this
block from the Coupling Facility structure.
4.1.6 General guidelines to improve performance with OSAM DB CF caching
There are four principal guidelines associated with OSAM DB CF caching:
If you have no need to perform data caching at the moment, allow DIRRATIO and
ELEMRATIO values to default to 999:1 in the DFSVSMxx member. This defines 999
directory entries ...
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