What is the primary purpose of a data dictionary in a database?

The primary purpose of a data dictionary in a database is to control data access and describe data structure. A data dictionary serves as a centralized repository of information about the data in the database. It includes details about the data types, constraints, relationships, and metadata associated with each data element. By providing a clear description of how data is structured and interrelated, the data dictionary aids in ensuring data integrity and consistency.

Furthermore, it plays a crucial role in managing access to the data, as it often contains permission levels or restrictions that dictate who can view or modify specific tables or fields within the database. This centralization of data definitions and access controls helps maintain security and organization, making the administration of the database more efficient and effective.