Which of the following is a key responsibility of a database administrator?

A key responsibility of a database administrator (DBA) is monitoring database security and performance. This role is critical for ensuring that databases run efficiently and are protected from unauthorized access or breaches. The DBA is typically tasked with implementing security measures, managing user access controls, and regularly reviewing and optimizing database performance metrics to identify and mitigate issues that could affect system reliability or efficiency.

Monitoring involves various activities, including analyzing database traffic, troubleshooting performance bottlenecks, and ensuring that backups are conducted regularly to prevent data loss. By focusing on these aspects, the DBA helps maintain the integrity of the database and ensures it meets organizational needs effectively.

The other responsibilities listed, while important in their own right, do not fall under the primary duties of a DBA. For instance, conducting training sessions for staff typically aligns more closely with roles in operations or human resources rather than being a core function of database administration. Designing user interface prototypes is more aligned with user experience or web development roles, and assessing hardware requirements relates to systems administration or IT infrastructure planning, rather than database management specifically.