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Keyed Skip-Sequential Processing

Processing Method

VSAM keyed skip-sequential (SKP-sequential) processing works in a way similar to VSAM keyed sequential processing:

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

User-specified skips to other positions in the file can be made to a key or relative-record number that is greater than the current key or relative-record number. Backward SKP-sequential processing is not allowed.

DML Commands

CA IDMS VSAM Transparency translates VSAM calls for keyed SKP-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.