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 2. Introducing IMS data sharing 37
To perform block level data sharing of Virtual Storage Option (VSO) DEDB AREAs so
that multiple IMS subsystems can read and update the data concurrently, IMS uses a
cache structure in the Coupling Facility. Each CF cache structure is composed of a
directory and data portion. In IMS Version 8, and in IMS Version 7 with the appropriate
APAR (PQ50661), OS/390 system managed rebuild and automatic altering of structure
size support is available for shared VSO structures.
2.2.5 IMS Database Recovery Control (DBRC)
Every IMS instance in the Parallel Sysplex has its own Database Recovery Control (DBRC)
address space. DBRC controls the authorization of database access to application programs
executing within ...
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