CA IDMS/DB Schema and VSAM File Correspondences › Overview

Overview

Relate VSAM Structures to CA IDMS/DB Structures

CA IDMS VSAM Transparency supports VSAM data structures by establishing a one-to-one correspondence between a VSAM data structure and an CA IDMS/DB non-SQL set. All VSAM data structure types are supported, including:

• Key-sequenced data set (KSDS)
• Entry-sequenced data set (ESDS)
• Relative-record data set (RRDS)
• Alternate index (PATH)

Before CA IDMS VSAM Transparency can establish the correspondence between VSAM and CA IDMS/DB, you must represent the VSAM data structures in an CA IDMS/DB schema. Each VSAM data structure corresponds to a record within a system-owned indexed set. The record type, location mode used to store the data, and set order of the indexed set vary for each VSAM data structure type.

About This Chapter

The remainder of this chapter presents:

• The record definitions, set definitions, and location mode options that correspond to each of the data structures that CA IDMS VSAM Transparency supports
• General area and file considerations for defining CA IDMS VSAM Transparency data structures to the CA IDMS/DB schema

Note: Special considerations apply to KSDS, ESDS, and PATH data structures that contain variable-length records. These considerations are described in Appendix C, Length Record Considerations.