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

DEFINE CLUSTERDATACLASS(class)Identifies the name, 1-to-8 characters, of the data class for the data set. Itprovides the allocation attributes for new data sets. Your storage administratordefines the data class. However, you can override the parameters defined forDATACLASS by explicitly using other attributes. See “Specifying AttributeSelection Order” on page 14 for the order of precedence (filtering) the systemuses to select which attribute to assign.DATACLASS parameters apply to both SMS- and non-SMS-managed data sets.If DATACLASS is specified and SMS is inactive, DEFINE is unsuccessful.DATACLASS cannot be used as a subparameter of DATA or INDEX.Abbreviation: DATACLASERASE|NOERASESpecifies whether the cluster’s components are to be erased when its entry inthe catalog is deleted.ERASEOverwrites each component of the cluster with binary zeros when itscatalog entry is deleted. If the cluster is protected by a RACF generic ordiscrete profile and is cataloged, you can use RACF commands to specifyan ERASE attribute. If you do this, the data component is automaticallyerased upon deletion.Abbreviation: ERASNOERASESpecifies that each component of the cluster is not to be overwritten withbinary zeros. NOERASE will not prevent erasure if the cluster is protectedby a RACF generic or discrete profile that specifies the ERASE attributeand if the cluster is cataloged. Use RACF commands to alter the ERASEattribute in a profile.Abbreviation: NERASEXCEPTIONEXIT(entrypoint)Specifies the name of a user-written exception-exit routine, that receives controlwhen an exceptional I/O error condition occurs during the transfer of databetween your program’s address space and the cluster’s DASD space. Anexception is any condition that causes a SYNAD exit to be taken. Thecomponent’s exception-exit routine is processed first, then the user’s SYNADexit routine receives control. If an exception-exit routine is loaded from anunauthorized library during access method services processing, an abnormaltermination occurs. See z/OS DFSMS: Using Data Sets.Abbreviation: EEXTFILE(ddname)Names the DD statement that identifies and allocates the DASD and volumesthat must be available for space allocation on the volumes specified by theVOLUMES keyword. If more than one volume is specified, all volumes mustbe the same device type.If data and index components are to reside on separate devices, you canspecify a separate FILE parameter as a parameter of DATA and INDEX topoint to different DD statements.If the FILE parameter is not specified, an attempt is made to dynamicallyallocate the required volumes. The volume must be mounted as permanently154 z/OS V1R6.0 DFSMS Access Method Services for Catalogs