A one-to-one relationship exists between page sets and the VSAM data sets used to store the pages. The identifier consists of a number in the range 00 through 99. It is used to generate a ddname, which references the VSAM ESDS data set, in the range CSQP0000 through CSQP0099.
The identifier must not be the same as any other page set identifier currently defined on this queue manager.
If the buffer pool has not already been created by a DEFINE BUFFPOOL command, it is created with 1000 buffers.
See the WebSphere MQ for z/OS Concepts and Planning Guide for more information about the EXPAND parameter.
At restart, if a previously used page set has been replaced with a data set that is smaller, it is expanded until it reaches the size of the previously used data set. Only one extent is required to reach this size.
A secondary extent size that is approximately 10 per cent of the current size of the page set is used. It may be rounded up depending on the characteristics of the DASD.
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