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

DEFINE ALTERNATEINDEXDATACLASS parameters apply to both SMS-managed and non-SMS-manageddata sets. If DATACLASS is used and SMS is inactive, the DEFINE isunsuccessful.You cannot use DATACLASS as a subparameter of DATA or INDEX.Abbreviation: DATACLASERASE|NOERASEindicates if the records of the alternate index components are erased when thealternate index is deleted.ERASERequires the records of the alternate index components are overwrittenwith binary zeros when the alternate index is deleted. If the base cluster ofthe alternate index is protected by a RACF generic or discrete profile andthe base cluster is cataloged in a catalog, you can use RACF commands tospecify an ERASE attribute as part of this profile so that the component isautomatically erased upon deletion.Abbreviation: ERASNOERASESpecifies that the records of the alternate index components are not to beoverwritten with binary zeros. NOERASE prevents the component frombeing erased if the base cluster of the alternate index is protected by aRACF generic or discrete profile that specifies the ERASE attribute and ifthe base cluster is cataloged in a catalog. You can use RACF commands toalter the ERASE attribute in a profile.Abbreviation: NERASEXCEPTIONEXIT(entrypoint)The name of your exception exit routine, that receives control when anexceptional I/O error condition occurs during the transfer of data betweenyour program’s address space and the alternate index’s direct access storagespace. (An exception is any condition that causes a SYNAD exit to be taken.)The component’s exception exit routine is processed first; then SYNAD exitroutine receives control. If an exception exit routine is loaded from anunauthorized library during access method services processing, an abnormaltermination occurs.Abbreviation: EEXTFILE(ddname)Names the DD statement that identifies the direct access devices and volumeson which to allocate space to the alternate index. If more than one volume isspecified in a volume list, all volumes must be the same device type.When the data component and index component are to reside on differentdevices, you can create a separate FILE parameter as a parameter of DATA andINDEX to point to different DD statements.If the FILE parameter is not used, an attempt is made to dynamically allocatethe required volumes. The volumes must be mounted as permanently residentor reserved.The DD statement you specify must be://ddname DD UNIT=(devtype[,unitcount]),// VOL=SER=(volser1,volser2,volser3,...),DISP=OLDChapter 13. DEFINE ALTERNATEINDEX 133