Preparing Control Information › Overview

Overview

FMT and TNT Tables

CA IDMS VSAM Transparency uses two control tables to establish the correspondences between VSAM and the database:

• The file management table (FMT) maps VSAM data structures to CA IDMS/DB records and sets. CA IDMS VSAM Transparency requires one file management table for each VSAM data set to be processed.
• The transaction name table (TNT) maps CICS transactions to CA IDMS/DB subschemas. The TNT is optional if all transactions are to use the same subschema; it is required if different subschemas are to be used.

Before an application program can be run with CA IDMS VSAM Transparency, you must compile, assemble, and link edit the appropriate FMTs and TNTs. Only one FMT or TNT can be compiled in a single execution of the corresponding compiler.

About This Chapter

This chapter describes how to execute file management and transaction name tables and presents information as follows:

• Compiler-directive statements specify in-stream processor control information for the FMT and TNT compilers.
• FMT statements establish the correspondence between VSAM data structures and CA IDMS/DB records and sets.
• TNT statements establish the correspondence between CICS transaction names and CA IDMS/DB subschema names.

Flow Diagram

The following diagram illustrates the compilation, assembly, and link editing of the user-supplied FMT or TNT statements that must occur before an application program can be run with CA IDMS VSAM Transparency.