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 3. Data sharing integrity components 59
AREAs that are defined with SHARELVL(0 | 1) are read into and written from an OS/390 data
space. AREAs defined with SHARELVL(2 | 3) use the Coupling Facility to share data between
connected subsystems.
The basic unit of interaction with the Coupling Facility that contains the DEDB VSO AREA is
the control interval. Segment level locking is not supported for SHARELVL(2/3) with the virtual
storage option. Non-shared VSO AREAs still use segment level locking.
The following types of locks are used with data entry databases for block level data sharing.
3.6.1 Control interval locks
Control interval locks are used to prevent access to uncommitted updates and to serialize
updates to control intervals.
Control ...
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