CA IDMS/DB Schema and VSAM File Correspondences › Relative-Record Data Set › Record and Set Representations

Record and Set Representations

In an CA IDMS/DB database, an RRDS data set corresponds to a system-owned indexed set with a set order of SORTED (on an added control field). To represent a VSAM RRDS in an CA IDMS/DB database, you must include the following definitions in the schema:

• A record type whose description corresponds to the RRDS record.
• A four-byte control field added to the end of the record. This field will contain the relative-record number. It must be included in the subschema definition of the record for all applications that access the record.

  Note: The control field will not be passed back to the application program.

• An indexed set whose owner is SYSTEM and whose member record is the record type described above.
• A set order of SORTED (on the CA IDMS VSAM Transparency control field that holds the relative-record number).
• A duplicates option of DUPLICATES NOT ALLOWED.