Persistent messages are logged. Logging messages reduces the performance of your application, so you should use persistent messages for essential data only. If the data in a message can be discarded if the queue manager stops or fails, use a nonpersistent message.
Data for persistent messages is written to log buffers. These buffers are written to the log data sets when:
If an application processes many messages in one unit of work this causes less input/output than if the messages were processed one for each unit of work, or out of syncpoint.
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