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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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LISTCAT OutputTRKOVFL—The physical blocks of a page space data set can span a trackboundary.UNIQUEKEY—Indicates, <strong>for</strong> an alternate index, that the alternate-key valueidentifies one, and only one, data record in the base cluster.UPDATE—When the path is opened, the upgrade set’s alternate indexes(associated with the path’s base cluster) are also opened and are updated when thebase cluster’s contents change.UPGRADE—When the alternate index’s base cluster is opened, the alternate indexis also opened and is updated to reflect any changes to the base cluster’s contents.WRITECHECK—Write operations are checked <strong>for</strong> correctness.GDG: Generation Data Group Base Entry, Special FieldsThe special fields <strong>for</strong> a generation data group base entry describe attributes of thegeneration data group.ATTRIBUTESThis field includes the following fields:EMPTYAll generation data sets in the generation data group are uncatalogedwhen the maximum number (given under LIMIT) is reached and one moredata set is to added to the group.LIMITThe maximum number of generation data sets allowed in the generationdata group.NOEMPTYOnly the oldest generation data set in the generation data group isuncataloged when the maximum number (given under LIMIT) is reachedand one more data set is to be added to the group.N<strong>OS</strong>CRATCHGeneration data sets are not to be scratched (see SCRATCH below) whenuncataloged.SCRATCHGeneration data sets are to be scratched (that is, the DSCB describing eachone is removed from the VTOC of the volume where it resides) whenuncataloged.NVS: Non-VSAM Entry, Special FieldThe special field <strong>for</strong> a non-VSAM data set describes a non-VSAM data set storedon magnetic tape.FSEQN—The sequence number (<strong>for</strong> the tape volume indicated under the“VOLUMES group” keyword VOLSER) of the file in which the non-VSAM data setis stored.HIS: History GroupThe fields in this group identify the object’s owner and give the object’s creationand expiration dates.370 z/<strong>OS</strong> <strong>V1R6.0</strong> <strong>DFSMS</strong> <strong>Access</strong> <strong>Method</strong> <strong>Services</strong> <strong>for</strong> <strong>Catalogs</strong>

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