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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72 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
3.9.1 OSAM and VSAM buffer invalidation using XES services
OSAM and VSAM buffer invalidation structures are built in the Coupling Facility. For each
block or control interval of shared data read by an IMS from the sharing group, an entry is
made in the OSAM or VSAM structure. Each entry consists of a field for the buffer ID and 255
slots for the IMS subsystems to register interest in an entry's buffer. When an IMS subsystem
reads a block or control interval, a bit in the hardware system area (HSA) is turned to “valid”
and the interest is registered in the Coupling Facility as a block-to-buffer relationship.
When an update to a block or control interval is committed
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