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z/OS V1R6.0 DFSMS Access Method Services for Catalogs

z/OS V1R6.0 DFSMS Access Method Services for Catalogs

z/OS V1R6.0 DFSMS Access Method Services for Catalogs

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DEFINE GENERATIONDATAGROUPvvvEMPTY specifies that all data sets in the group are to be uncataloged by VSAMwhen the group reaches the maximum number of data sets (as specified by theLIMIT parameter) and one more GDS is added to the group.N<strong>OS</strong>CRATCH specifies that when a data set is uncataloged, its DSCB is not tobe removed from its volume’s VTOC. There<strong>for</strong>e, even if a data set isuncataloged, its records can be accessed when it is allocated to a job step withthe appropriate JCL DD statement.LIMIT, a required parameter, specifies that the maximum number of GDGs inthe group is 255.The second job, DEFGDS, allocates space and catalogs a GDS into thenewly-defined GDG, ICFUCAT1.GDG02. The job control statement GDSDD1 DDspecifies that an SMS GDS, ICFUCAT1.GDG02(+1), is allocated by the schedulerwith a storage class GRPVOL1,Chapter 15. DEFINE GENERATIONDATAGROUP 179

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