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

ALTERINHIBITUsed when the entry being altered is to be read only.Abbreviation: INHUNINHIBITIndicates that the read-only restriction set by a previous ALTER orEXPORT command is to be removed.Abbreviation: UNINHKEYS(length offset)Specifies the length and offset of the object’s key. If the altered entry defines analternate index, offset applies to the alternate key in the data records in thebase cluster.Restrictions: Use KEYS if all the following are true:vvvvvThe object whose entry is being altered is an alternate index, a path, akey-sequenced cluster, or a data component of a key-sequenced cluster oralternate index.The object whose entry is being altered contains no data records.The values for KEYS in the object’s catalog entry are default values. Fordefault values, see the DEFINE command for the object.The new values for KEYS do not conflict with the control interval sizespecified when the object was defined.The key fits within the record whose length is specified by theRECORDSIZE parameter.v The key fits in the first record segment of a spanned record.length offsetIs the length of the key (between 1 and 255), in bytes, and its displacementfrom the beginning of the data record, in bytes. The length of the offsetcannot be greater than the length of the data record.If the values for KEYS in the object’s catalog entry are not default values andALTER KEYS specifies those same values, processing continues for any otherparameters specified in the command, and no error message is issued.LOG(NONE|UNDO|ALL)Establishes whether the sphere to be accessed with VSAM record-level sharing(RLS) or DFSMStvs is recoverable or nonrecoverable. It also indicates whetheror not forward recovery logging should be done for the sphere. LOG applies toall components in the VSAM sphere.NONEIndicates that neither an external backout nor a forward recovery capabilityis available for the spheres accessed in VSAM RLS or DFSMStvs mode. Ifyou use this, VSAM RLS and DFSMStvs consider the sphere to benonrecoverable.UNDOSpecifies that changes to the sphere accessed in VSAM RLS or DFSMStvsmode can be backed out using an external log. VSAM RLS and DFSMStvsconsider the sphere recoverable when you use LOG(UNDO).ALLSpecifies that changes to the sphere accessed in VSAM RLS or DFSMStvsmode can be backed out and forward recovered using external logs. VSAMRLS and DFSMStvs consider the sphere recoverable when you use62 z/OS V1R6.0 DFSMS Access Method Services for Catalogs