Final answer:
A database administrator must have knowledge of data warehouse and data-mining tools. This role involves various responsibilities including managing and troubleshooting databases, which is essential in an information-driven society.
Step-by-step explanation:
In the context of IT jobs, a person who must have knowledge and understanding of data warehouse and data-mining tools is a database administrator. Database administrators are responsible for the performance, integrity, and security of a database. They also plan and develop the database, as well as troubleshoot any issues on behalf of the users. Knowing how to handle data warehouses is essential for storing and organizing large quantities of data, while data mining skills are required to analyze that data to find patterns and useful information. This knowledge is becoming more important in a variety of fields as our society heavily relies on data for making informed decisions.