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

ALTER[UPDATE|NOUPDATE][UPGRADE|NOUPGRADE][WRITECHECK|NOWRITECHECK][CATALOG(catname)]Entry Types That Can Be AlteredAn “X” in Figure 1 on page 55 indicates that you can alter the value or attributefor the type of catalog entry that is shown. Some attributes only apply to either thedata or the index component of a cluster or alternate index entry. You can usesome attributes only for the data or index component of a cluster or alternateindex entry; you must then identify the entryname of the component. Use theLISTCAT command to determine the names generated for the object’s components.You can identify a group of entries with a generic name. Entrynames that matchthe supplied qualifiers are altered if they have the information that is used withthe ALTER command.You cannot alter alias entries or a master catalog’s self-describing entries, nor canyou change a fixed-length relative record data set to a variable-length relativerecord data set, or the reverse. You cannot change a linear data set (LDS) to anyother VSAM data set format. Any attempt to alter a data set defined with a devicetype named by the user (for example, SYSDA) is unsuccessful.When the data set characteristics being altered are for a compressed data set, themaximum record length of the control interval size is less than if compression isnot done.54 z/OS V1R6.0 DFSMS Access Method Services for Catalogs