A centralized repository of information about the basic organization of a database and data such as meaning, origin, usage, relationship with other data, and format is called a data dictionary. Basically, a data dictionary defines the structure of the database itself. It also refers to other description about databases or a collection of databases. It does not contain any of the actual data from the database, but only data necessary for managing it.
Data dictionary essentially stores metadata - something that stores data about data.
A data dictionary is essentially of two types – active and passive
Some of the data stored by the data dictionary includes:
- Name
- Description
- Frequency of use
- Characteristics
- Access rights
Hence, this concludes the definition of Data Dictionary along with its overview.
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