Defining description lines in a Database Block

You define the description lines of a Database Block in a tab that is specific to each Database Block type. The -DH Lines tab is specific to the hierarchical Database Blocks. The -DR Lines tab is specific to the relational Database Blocks. The -DC Lines tab is specific to the CODASYL, DMSII, and TANDEM Database Blocks.

About this task

The various description lines are used for specific purposes:
  • The -DC lines are used to logically describe a CODASYL schema or subschema: declare areas, call records and distribute them among areas, define, and describe sets (code, name, owner record, member record).
  • The -DH lines are used to describe the relationships between Segments in a hierarchical database (example: DL/1).
  • The -DR lines are used to specify the SQL objects that constitute a relational database (table spaces, tables, table views, index, or key).
In the tab that is dedicated to the description lines of a Block, you specify the description lines of the current Block in a table. You can also delete or reorganize lines. The other part of the tab displays a definition section that opens when you select a description line in the table. In this section, you can give further information about the selected description line. Moreover, you can access the -GG Lines by clicking -G Lines and specify the generation elements that are associated with the selected description line.

Procedure


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