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

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

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Chapter 15. DEFINE GENERATIONDATAGROUPThe DEFINE GENERATIONDATAGROUP command creates a catalog entry <strong>for</strong> ageneration data group (GDG). For in<strong>for</strong>mation on generation data group wrappingrules, see z/<strong>OS</strong> MVS JCL User’s Guide. The syntax of the DEFINEGENERATIONDATAGROUP is:DEFINEGENERATIONDATAGROUP(NAME(entryname)LIMIT(limit)[EMPTY|NOEMPTY][OWNER(ownerid)][SCRATCH|N<strong>OS</strong>CRATCH][TO(date)|FOR(days)])[CATALOG(catname)]DEFINE can be abbreviated: DEFDEFINE GENERATIONDATAGROUP ParametersRequired ParametersGENERATIONDATAGROUPSpecifies that a generation data group (GDG) entry is to be defined. A GDGcan contain both SMS- and non-SMS-managed generation data sets. Ageneration data set (GDS) cannot be a VSAM data set. If you create a GDG andits catalog is on an SMS-managed volume, you should remove anydependencies on pattern DSCBs. See z/<strong>OS</strong> <strong>DFSMS</strong>: Using Data Sets <strong>for</strong>in<strong>for</strong>mation about GDGs and GDSs.Abbreviation: GDGNAME(entryname)Specifies the name of the GDG being defined.LIMIT(limit)Specifies the maximum number, from 1 to 255, of GDSs that can be associatedwith the GDG being defined.Abbreviation: LIMOptional ParametersCATALOG(catname)Identifies the catalog in which the generation data group is to be defined. Ifthe catalog’s volume is physically mounted, it is dynamically allocated. Thevolume must be mounted as permanently resident or reserved. See “CatalogSelection Order <strong>for</strong> DEFINE” on page 11 <strong>for</strong> the order in which a catalog isselected when the catalog’s name is not specified.Abbreviation: CAT© Copyright IBM Corp. 1973, 2004 175

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