Data Description Phase › Steps of the Data Description Phase › Step 4—Prepare the Logical CA IDMS/DB Database

Step 4—Prepare the Logical CA IDMS/DB Database

In this step you prepare generator control statements. These statements describe the logical component of the CA IDMS/DB database (the schema and subschema).

Detailed information for each generator control statement is presented in the next section.

The control statements and the Total DDL statements you prepared in step 2 are used to:

• Produce a complete schema description that reflects the Total database
• Produce complete subschema descriptions that reflect the Total database
• Build the loader module (ETOTLOAD); ETOTLOAD contains the information necessary to establish correspondence between the structure of the unloaded Total database and that of the CA IDMS/DB database
• Build a runtime control table (ETOTTBL); ETOTTBL replaces the Total DBMOD; ETOTTBL contains information that associates database requests in Total programs with the appropriate CA IDMS/DB data descriptions and relationships

Note: After you code the control statements you can move on to the next transparency phase (see Database Conversion Phase).