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 5. IMS shared queues 119
CQS takes system checkpoints, with the log records also going to the System Logger. The log
token of the beginning of the checkpoint log records is kept in a checkpoint data set for each
CQS. Another copy is kept on the CONTROLQ in the structure. Think of the checkpoint
records, such as the IMS x'40xx' system checkpoint records, and the checkpoint data set,
such as the IMS restart data set (RDS).
CQS also takes structure checkpoints. These are logical copies of the contents of the
structure at the time the structure checkpoint is initiated. You can call them logical copies
because only the data content is co
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