Page set usage

In the case of short-lived messages, few pages are normally used on the page set and there is little or no I/O to the data sets except at startup, during a checkpoint, or at shutdown.

In the case of long-lived messages, those pages containing messages are normally written out to disk. This is performed by the queue manager in order to reduce restart time.

You should separate short-lived messages from long-lived messages by placing them on different page sets and in different buffer pools.