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

DEFINE CLUSTER||||||||||||||||For SMS-managed data sets, the expiration date in the catalog is updated andthe expiration date in the format-1 DSCB is changed. If the expiration date inthe catalog does not agree with the expiration date in the VTOC, the VTOCentry overrides the catalog entry.TO(date)Specifies the earliest date that a command without the PURGE parametercan delete an entry. Specify the expiration date in the form yyyyddd, whereyyyy is a four-digit year (to a maximum of 2155) and ddd is the three-digitday of the year from 001 through 365 (for non-leap years) or 366 (for leapyears).The following four values are ″never-expire″ dates: 99365, 99366, 1999365,and 1999366. Specifying a ″never-expire″ date means that the PURGEparameter will always be required to delete an entry. For relatedinformation, see the ″EXPDT Parameter″ section of z/OS MVS JCL Reference,SA22-7597.Notes:1. Any dates with two-digit years (other than 99365 or 99366) will betreated as pre-2000 dates. (See note 2.)2. Specifying the current date or a prior date as the expiration date willmake an entry immediately eligible for deletion.FOR(days)Shows the number of days to keep the cluster being defined. Themaximum number is 9999. If the number is 0 through 9998, the cluster isretained for the number of days; if the number is 9999, the cluster isretained indefinitely.WRITECHECK|NOWRITECHECKindicates whether the cluster or component is to be checked by a machineaction called write check when a record is written into it.The WRITECHECK setting is ignored when the data set is opened for VSAMRLS or DFSMStvs access.WRITECHECKShows that a record is written and then read, without data transfer, to testfor the data check condition.Abbreviation: WCKNOWRITECHECKUse when the cluster or component is not to be checked by a write check.Abbreviation: NWCKData and Index Components of a ClusterDEFINE CLUSTER ExamplesYou should use attributes separately for the cluster’s data and index components.A list of the DATA and INDEX parameters is provided at the beginning of thissection. These parameters are described in detail as parameters of the cluster as awhole. Restrictions are noted with each parameter’s description.The DEFINE CLUSTER command can perform the functions shown in thefollowing examples.166 z/OS V1R6.0 DFSMS Access Method Services for Catalogs