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 71
STAGE E
If there is contention; in other words, if there is another lock that has randomized to this
entry, XES uses cross-system coupling facility (XCF) communication with XESs in the
other systems to determine if, in fact, an incompatible request (a request for a lock on the
same resource) has occurred:
If so, then the request is queued, and must wait.
If it is determined that another system holds a lock for another database record that just
happened to randomize to the same entry, then the lock request is granted. This is known
as
false contention
.
It is important to note that requests for a lock, ...
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