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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28 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
Figure 1-15 Example of CQS EVENTQ monitoring (continued)
The enqueuing of the EMC to CQSA’s EVENTQ causes CQSA’s list notification vector to be
set, which in turn causes the list transition exit to be driven. All CQS knows at this time is that
there is something on the queue, but doesn’t know what. The exit will invoke list services to
read the EMC and dequeue it from the EVENTQ. Now that CQS knows what was on the
queue, it can notify IMSA. IMSA will, eventually, read the transaction from the shared queue,
process it, and delete it. A similar sequence of events will occur ...
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