If you have a requirement of 20 items of size 5KB per second and you use strongly consistent reads, how many read capacity units would you need?

To determine the required read capacity units for a DynamoDB table when performing strongly consistent reads, it's important to first understand how read capacity units work. For strongly consistent reads, each read consumes one read capacity unit per item fetched, regardless of the size of the items.

In this scenario, you have a requirement for 20 items, each measuring 5KB, per second. Since you are performing strongly consistent reads, each of the 20 items will require one read capacity unit each.

Therefore, the calculation is straightforward:

• 20 items × 1 read capacity unit per item = 20 read capacity units.

This means that to meet the requirement of retrieving 20 items per second with strongly consistent reads, you would need a total of 20 read capacity units.