Which of the following describes the key function of database tuning?

The key function of database tuning is optimizing database performance. This process involves making adjustments and improvements to a database system to ensure it operates as efficiently and effectively as possible. It includes activities such as analyzing query execution times, indexing strategies, and resource usage patterns to identify bottlenecks and enhance speed and responsiveness.

Optimizing database performance typically leads to improved application performance, allowing for faster data retrieval and processing. This is crucial in environments where large volumes of queries are executed, ensuring that users can access the information they need without unnecessary delays.

While enhancing the physical security of a system is important for protecting data integrity and privacy, it does not directly contribute to performance optimization. Similarly, standardizing data formats and maintaining historical data logs serve different purposes, focusing more on data consistency and compliance rather than enhancing the overall operational efficiency of the database. Thus, the correct choice reflects the main goal of database tuning as it seeks to fine-tune the system for improved performance.