Restarting CQS

After CQS completes the structure initialization, it continues with the restart. CQS can do either a cold restart or a warm restart. Restarting CQS affects only the units of work that this CQS manages. Restarting does not back out or restore any units of work owned by another CQS.

When you have completed restarting all structure pairs for a particular CQS, the CQS ready message is issued (CQS0020I).

Since changes to resource structures are not check pointed or logged, restarting CQS does not affect units of work for resource structures.

The frequency of system checkpoints affects restart. CQS must read more log records when checkpoints are infrequent than when checkpoints occur more often. Also, the amount of logging that one CQS performs can affect another CQS during restart. All CQSs write to the same log, so a CQS restarting must read all log records written by all CQSs.

CQS takes an initial system checkpoint at the end of a restart.