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Practice Set 1

Our DynamoDB table items are 3KB in size. Your workload requires 10 reads/sec (strongly consistent) and 2 writes/sec. How much RCU and WCU should you configure on your table with pre-provisioned capacity?
Write: 3 KB / 1 KB = 3 * 2 writes per second = 6 WCU
Eventually consistent reads below 4KB: 0.5 * 10 = 5 RCU
Strongly consistent reads below 4KB: 1 * 10 = 10 RCU
Transactional read of 8KB at 10 reads per second = 8KB / 4KB = 2 * 2 = 4 * 10 = 40 RCU
Source
Next Chapter: Practice Set 1