WebSphere MQ can use a page set up to 64GB in size, provided the data set is defined with 'extended addressability' to VSAM. Extended addressability is an attribute which is conferred by an SMS data class. In the examples below, the management class 'EXTENDED' is defined to SMS with 'Extended addressability'. If your existing page set is not currently defined as having extended addressability, use the following method to migrate to an extended addressability format data set.
The following JCL shows example Access Method Services commands:
//S1 EXEC PGM=IDCAMS //SYSPRINT DD SYSOUT=* //SYSIN DD * ALTER 'VICY.CSQ1.PAGE01' - NEWNAME('VICY.CSQ1.PAGE01.OLD') ALTER 'VICY.CSQ1.PAGE01.DATA' - NEWNAME('VICY.CSQ1.PAGE01.DATA.OLD') DEFINE CLUSTER (NAME('VICY.CSQ1.PAGE01') - MODEL('VICY.CSQ1.PAGE01.OLD') - DATACLASS(EXTENDED)) REPRO INDATASET('VICY.CSQ1.PAGE01.OLD') - OUTDATASET('VICY.CSQ1.PAGE01') /*
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