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 69
If, on the other hand, the lock table indicates that IRLM-to-IRLM communication is required to
grant a lock, the lock table indicates which IRLMs need to be involved. This limits the number
of IRLMs that need to communicate about a lock request.
The record list portion of the lock structure
The record list consists of record entries for uncommitted IMS updates.
Whenever an application program uses a program communication block with update intent,
the lock request on the database record level lock is flagged with a modify attribute. If any
segments are updated by this application, the block level lock will be flagged with a modify as
well as a force attribute. This will cause IRLM to write modif ...
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