The Data Structure entity

Data Structures describe all the data sets that are processed by the applications. These data sets are represented by Segments or Tables.

A data Structure groups the Segments in a logical way. Segments can represent elements such as:

A Data Structure is described logically, with no physical characteristics. This description can then be reused for different purposes:
Example: A Segment can be used in a database and in the Programs that access the database.

Information of a physical nature (such as organization or block size) is added when the Data Structure is used in Programs or Database Blocks.


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