Accessing File Descriptions

Master and Access Files are stored as comma-delimited sequential files. On VM, Master Files have filetype MASTER and Access Files have filetype FOCIDMS. On MVS, Master Files are members of a PDS allocated to ddname MASTER and Access Files are members of a PDS allocated to ddname FOCIDMS. Each Master File has a corresponding Access File. On VM, they have the same file names. On MVS, they have the same member names.

	VM/CMS	MVS
Master File	SALES MASTER	//MASTER DD DSN=dsname1
Access File	SALES FOCIDMS	//FOCIDMS DD DSN=dsname2

Note:

• CMS files can be on any accessed disk, not necessarily the same for both. The file name chosen for the Master File definition of an IDMS structure is purely suggestive and bears no relation to any internal IDMS names.
• MVS files are members of partitioned data sets allocated to the ddnames in the table. Associated Master and Access Files must have the same member names, SALES in this example. Any data set name is valid, but names that indicate the function of the data set are recommended for documentation purposes.

This chapter concentrates on the Master File and its components. It contains brief examples of syntax. (For more detailed examples, see CA-IDMS Data Adapter Samples.) Consult CA-IDMS Data Adapter Access Files, for additional information.