Question

An application is being developed that is going to write data to a DynamoDB table. You have to set up the read and write throughput for the table. Data is going to be read at the rate of 300 items every 30 seconds. Each item is of size 6KB. The reads can be eventual consistent reads.

What would be the Read Capacity Unit that needs to be set on the table?

A. 10

B. 20

C. 6

D. 30

Answer 1

Answer - A.

Since there are 300 items read every 30 seconds, that means there are (300/30) = 10 items read every second.

Since each item is 6KB in size, that means 2 reads will be required for each item.

The question specified "eventual consistent reads" which means we need to divide by 2 since 1 RCU has two eventually consistent reads.

So we have a total of 2*(10 / 2) = 2*5= 10 reads for the number of items per second.