From the course: Migrating COBOL Apps

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Classification of legacy data

Classification of legacy data - COBOL Tutorial

From the course: Migrating COBOL Apps

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Classification of legacy data

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- [Instructor] The data used in a legacy system can be partitioned into two classes, primary data and residual data. Primary data is needed to carry out the application's business functions. Residual data is used by the legacy system, but is not necessary for carrying out the business functions of the application. It must, however, remain in the database until all the procedures that use it have been re-engineered. Primary data can be sub-classified into conceptual data and part of the structural data. Conceptual data is specific to the application domain, and used to describe particular concepts having to do with that application. Users understand its meaning, because it refers to concepts that they are familiar with. Structural data is that which is used to organize and support the data structure in the legacy system, for example, the codes used as the primary keys for the conceptual or business data. Residual data…

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