Symbolic fields related to VSAM parameters have additional capabilities. By default, symbolic names evaluate the data associated with the cluster component of a VSAM file. To force the evaluation of a particular component of the VSAM file, the symbolic name should be prefixed with “C:” for cluster, “D:” for data, or “I:” for index. For example, the following expression can be used to evaluate the name of the data component.
IF &D:DSNAME = *ACCIVP*When no component is specified, the Monitor defaults to the cluster component. During compare processing or message build, the product will automatically attempt to access the data component fields when the cluster field is not available. No attempt to substitute the data component is made when “C:” is explicitly specified. During SET processing, the “D:” and “I:” suffixes are required to update fields associated with the data and index components of a VSAM file.