Processing Options
Both VSAM and CA IDMS VSAM Transparency allow data access by key or by address. VSAM can access and process records by relative byte displacement from the beginning of the file (RBA), by relative-record number (RRN), or by prime or alternate key. CA IDMS/DB accesses and processes records through Data Manipulation Language (DML) statements that operate on schema-defined records and sets.
At runtime, CA IDMS VSAM Transparency translates the most commonly used VSAM processing options into DML statements. This translation is transparent to the VSAM program.
About This Chapter
The remainder of this chapter discusses the VSAM processing modes and their DML correspondences presented by:
These discussions are followed by a table that summarizes the correspondences between VSAM commands and DML commands, and a discussion of additional VSAM options.
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