The Integrated Data Dictionary (IDD) acts as a central repository of information about data. The developer uses the dictionary to store definitions of the application's data elements, records, tables, and maps, as well as the processing modules associated with an application. IDD maintains information about the data stored in the application database and makes this information directly available to the applications. IDD comprises the dictionary itself (that is, the repository of information about data) and software components for accessing (that is, adding, modifying, deleting, and displaying) the dictionary-stored information.
IDD enables batch and online entry and examination of entity definitions stored in the dictionary.
For example, the application designer can request the display of an element definition, a record definition, or a user-defined entity (a site-specific data category defined by the DBA). The displayed information shows the definition of the entity itself as well as contextual information.
For information on how data can be defined for an application, see Chapter 2, Design Methodology.
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