Record Access and Processing › Keyed Access › Keyed Sequential Processing

Keyed Sequential Processing

Processing Method

VSAM keyed sequential processing works as follows:

• A position in the file can be established with a POINT call that uses a prime key, alternate key, or relative-record number.
• Records are then retrieved in ascending, logical, keyed sequential order (GET NEXT).

DML Commands

CA IDMS VSAM Transparency translates VSAM calls for keyed sequential processing into the following commands:

• A POINT call is translated into the FIND WITHIN SET USING SORTKEY DML command.
• A GET call is translated into the OBTAIN FIRST/NEXT WITHIN SET DML command.