CQS structure recovery data set

Whenever a CQS subsystem takes a structure checkpoint, it writes a snapshot of the message queues to a structure recovery data set. It also writes some log records to the system logger log stream. The structure recovery data set is used to recover the message queues.

CQS subsystems in a sysplex share the structure recovery data sets; there is one pair (two data sets) for each structure. CQS alternates between the two for each checkpoint.