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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90 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
FDBR monitors an IMS subsystem using the IMS log and XCF status monitoring services.
When it determines that the IMS has failed, FDBR dynamically backs out uncommitted
updates for full function databases and does the redo processing for DEDBs. These are
functions that would be performed by emergency restart.
When FDBR completes the back outs and redos, it releases the locks held by the failed
subsystem. This allows any sharing subsystems to acquire these locks. From the time of the
IMS failure until the locks are released, other subsystems requesting the locks will receive
lock rejects which usually result in U3303 abends of application programs.
FDBR is not a replacem ...
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