How many CPU shares can be used by a SQL Statement in a medium database service?

The question concerns the allocation of CPU shares for SQL statements within a medium database service. In the context of database management systems, CPU shares are essential for managing how much processing power is allocated to various tasks.

The correct answer of 2 CPU shares reflects a specific configuration for a medium database service. This suggests that the medium tier is designed to handle a reasonable amount of workload while ensuring that the resources are not over-allocated, which would lead to inefficient resource use and potential performance degradation for all tasks running on the database.

Each of the other answer choices represents a higher allocation of CPU shares than what is typically allowed for a medium service, indicating that those configurations might pertain to different service tiers or specific conditions where higher performance is required. The adoption of a conservative allocation of CPU shares in the medium service tier allows for effective resource management, where various SQL statements can compete fairly for computing resources while ensuring that the overall system remains stable and responsive.