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

DEFINE CLUSTER|||||||||||||||||REDOEnables the VSAM batch logging function for your VSAM data set. TheLOGSTREAMID parameter indicates changes that are made byapplications that are written to the MVS log stream. When specifyingFRLOG(REDO), you must also specify LOGSTREAMID.UNDOEnables the changes made to your VSAM data set to be backed out usingthe VSAM logging. The LOGSTREAMID parameter indicates changes thatare made by applications that are written to the MVS log stream. Whenspecifying FRLOG(UNDO), you must also specify LOGSTREAMID.Restrictions:vIf you do not want VSAM batch logging for your data set, do notspecify the FRLOG parameter. If you specify FRLOG(NONE), the dataset must support VSAM batch logging, but logging is not in effect.v If FRLOG is specified, the data set:– Must be SMS-managed– Cannot be LINEAR or a temporary data setINDEXED|LINEAR|NONINDEXED|NUMBEREDShows the type of data organization for the cluster.If you want a data organization other than INDEXED (the default), you mustexplicitly use it with this parameter.When a cluster is defined, you indicate whether the data is to be indexed(key-sequenced), nonindexed (entry-sequenced), numbered (relative record), orlinear.Certain parameters apply only to key-sequenced clusters, as noted in thedescription of each of these parameters.Linear data set clusters are treated as ESDS clusters that must be processedusing control interval access.If you do not choose either the data organization or the MODEL parameter,your cluster defaults to key-sequenced (indexed).If you want to define an entry-sequenced or a relative record cluster, you mustspecify the NONINDEXED, the NUMBERED, or the MODEL parameter.The data organization you select must be consistent with other parameters youspecify.INDEXEDShows that the cluster being defined is for key-sequenced data. IfINDEXED is specified, an index component is automatically defined andcataloged. The data records can be accessed by key or by relative-byteaddress (RBA).Abbreviation: IXDLINEARSpecifies that the cluster being defined is for linear data. Because lineardata set clusters are treated as ESDS clusters that must be processed usingcontrol interval access, you can use most of the commands and parametersyou use to manipulate ESDS clusters. There are two exceptions:vvParameters that refer to logical records are not allowed (exceptRECORDS).Use partial printing by specifying the RBA syntax.156 z/OS V1R6.0 DFSMS Access Method Services for Catalogs