DL/I and CA IDMS/DB › The CA IDMS/DB Environment › Defining CA IDMS/DB Databases

Defining CA IDMS/DB Databases

Use Data Description Language (DDL)

The database administrator prepares the schema definition using source statements provided in the schema data description language (Schema DDL). The database administrator codes the subschema definitions using similar source statements provided in the subschema data description language (Subschema DDL).

You use CA IDMS physical data definition language statements to create a DMCL module that maps the schema areas to physical files and defines buffers for database operations.

Note: For more information about defining a DMCL, see the CA IDMS Database Administration Guide.

DDL Compilers Process Source Statements

Separate schema and subschema DDL compilers process the source statements. The CA IDMS Command Facility is used to produce assembler source for the DMCL module. The DMCL assembler source must then be assembled to produce object modules that map the logical areas into physical files and set up the necessary buffers.