A Data Dictionary is a Centralized Storage location for Information about the data that is stored in the Database. This Information is often called "Metadata"(Data about Data).
The Data Dictionary Provides answers to Questions such as:
- What Data contained in the database
- What are the attributes of the data: Name, Length, Format etc...
- What relationship exists among different data objects.
- Management of Data Definitions.
- Provision of information for evaluations.
- Support for Software Development
- Support for Documentation.
- Ensuring the Data Definitions are flexible and up to date.
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