Exam AWS Certified Developer Associate topic 1 question 392 discussion

Nothing was said about possible usage (I mean, how the data is queried). I also don't see any hints in the "rewards" domain. That's why I'd choose A... Although C is also a good option. On the other hand, imagine many users are signed up in one day. It can also impact the partitioning.

A is wrong because a randomly generated string isn’t useful as a partition key. How will you know what the partition key is when a customer visits the application and you need to lookup the customer’s points? The only option that makes sense is B. And customer’s full names are sufficiently unique.

This is because using the sign-up date as the partition key distributes the data evenly across partitions, reducing the risk of hot partitioning, which can impact performance.

A is correct

Its has to be unique number

Can be C . A partition key is used to determine the physical partition where the item is stored. The partition key should be chosen based on the access patterns of the data and how the data will be queried. In this scenario, the developer will likely want to query the data based on the date when the customer signed up for the rewards program, so using the date as the partition key will provide the best performance. Using a date as a partition key will also help to spread the data out over multiple partitions, avoiding partition overload.

The most unique and the highest cardinality

A it is