A telemetry container will hold billions of device readings. Which property chosen when the container is created decides how items and throughput are spread across physical storage units?
Show answer and explanation
Answer: C
The partition key value determines the logical partition each item belongs to, and logical partitions are mapped onto physical partitions that hold storage and throughput. A key with many distinct values, such as a device identifier, spreads load evenly across that mapping. Encryption keys protect data but do not place it, the index policy controls which paths are indexed, and consistency level governs read guarantees rather than placement.
Why the other options are wrong
- A. Customer-managed keys control encryption at rest, which protects the data without influencing how items are distributed across partitions.
- B. The index policy decides which properties are indexed for queries, so it affects query cost but not how data is placed on physical storage.
- D. Consistency level governs how quickly writes are visible to reads across replicas, so it does not decide the distribution of items or throughput.