What are these message classes in MQ 9.2 on z/OS?

I noticed that the MQ 9.2 documentation for z/OS refers to different message classes.  This is nothing very exciting. From the JCL it says

This sample shows 8 other page sets, three for each major class of message, and one for each other class:

  • 00 – object definitions
  • 01 – system-related messages
  • 02-04 – important long-lived messages
  • 05-07 – short-lived messages
  • 08 – miscellaneous messages

Basically it means provide multiple page sets for the major classes of messages. This gives more capacity and can spread the I/O work load.

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