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Metadata Management

Metadata is the road map or blueprint to that data. Just as a library card catalog points to both the content and the location of books in the library, metadata points to the location and meaning of various informational objects within the warehouse. Similarly, the data warehouse has to maintain a catalog of the items it manages. End users are like library customers, making requests for information based on selections made from a catalog. The process that fulfills their requests must know where the information is located within the data warehouse. The warehouse must therefore contain a component that fulfills the catalog functions for the information it manages.

This catalog is organized to do the following:

  • Serve as a map to the locations where information is stored in the warehouse
  • Include 2D components for every item, such as the definition needed by the database technology
  • table name and table owner) and the definition needed by the business user
  • Provide a blueprint for the way in which one kind of information is derived from another kind of information
  • Provide a blueprint for extractors that take data from operational systems and load it into the data warehouse
  • Store the business rules built into the data warehouse
  • Store the access control and security rules to support the administration of security
  • Make it possible for metadata to track changes over time
  • Organize metadata to be versioned to capture its change history
  • Store the structure and content of the data Identify clearly and formally the system of record for the data warehouse
  • Make available the integration and transformation logic as a regular part of the warehouse’s metadata
  • Store the history of data refreshment
  • Store metrics, so end users can determine whether a request will be large or small before submitting it

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