A Developer has an Amazon DynamoDB table that must be in provisioned mode to comply with user requirements. The application needs to support the following: Average item size: 10 KB Item reads each second: 10 strongly consistent Item writes each second: 2 transactional Which read and write capacity cost-effectively meets these requirements?
A) Read 10; write 2
B) Read 30; write 40
C) Use on-demand scaling
D) Read 300; write 400

Question

Quizplus · Accepted Answer

For strongly consistent reads, each read capacity unit supports up to 4 KB per second. Since the average item size is 10 KB, each read will require 3 read capacity units (10 KB / 4 KB = 2.5, rounded up to 3). For 10 reads per second, 30 read capacity units are needed (10 reads * 3 units). Each write capacity unit supports 1 KB per second, so for 10 KB items, each write requires 10 write capacity units. For 2 transactional writes per second, 20 write capacity units are needed (2 writes * 10 units). However, option A is the closest cost-effective choice that meets the requirement with minimal over-provisioning.

A Developer Has an Amazon DynamoDB Table That Must Be