What is a data dictionary used for in database management?

A data dictionary is an essential component in database management that serves as a centralized repository of information about the data within the database. Its primary purpose is to provide metadata, which describes the structure, organization, and constraints of the data contained in the database.

When it comes to controlling access and manipulation of the database, the data dictionary plays a crucial role. It defines the schema of the database, including details about tables, fields, data types, relationships, and any constraints that apply to the data. This includes information about permissions and roles, which dictate who can access or manipulate the data stored in the database. By leveraging this information, database management systems can enforce security protocols, ensuring that only authorized users can perform certain actions on the data.

In contrast, while a data dictionary supports the management of data and its organization, it is not directly involved in running queries or deleting data. Those functions are typically handled by different parts of a database management system. Therefore, the focus of the data dictionary on providing descriptive information and ensuring effective control of data access aligns directly with its role in database management.