How can a DBA effectively restrict user permissions?

How can a DBA effectively restrict user permissions?

• A. By introducing new user accounts
• B. Using a revoke operation to deny privileges
• C. Resetting all user accounts
• D. Changing user passwords

Answer: (B)

Restricting user permissions is a fundamental responsibility of a Database Administrator (DBA). The use of a revoke operation to deny privileges is a direct and effective method to manage user permissions. When a DBA revokes specific privileges from users, they can ensure that these users no longer have access to certain functionalities or data within the database.

This action allows for granular control over what users can or cannot do, in alignment with the principle of least privilege, which is an essential security practice. By using the revoke operation, the DBA can dynamically adjust permissions based on changes in user roles, requirements, or to enhance security when a user's responsibilities change or when a potential security threat is identified.

In contrast, introducing new user accounts does not inherently restrict existing permissions and may complicate permission management. Resetting all user accounts or changing user passwords deals with user authentication rather than the privileges assigned to those accounts. Therefore, while those actions could enhance security, they do not directly serve the purpose of restricting permissions.