フリー問題

問題文

A team considers duplicating items under a second partition key so that both access patterns are single-partition. What costs does this introduce?

選択肢

1. Only storage cost grows, because the second copy is maintained by the platform as part of the container definition and therefore needs no additional writes from the application
2. Nothing changes in cost, because the request unit charge is assessed per container rather than per item, so writing the same content twice into the same container is free
3. Storage and write cost double, and the two copies must be kept consistent by the application, because the platform does not keep the second copy in step with the first
4. The consistency level must be raised to strong for both copies, because the platform cannot guarantee that the two representations of the same item agree without it