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Exam AWS Certified Developer Associate topic 1 question 342 discussion

Exam question from Amazon's AWS Certified Developer Associate
Question #: 342
Topic #: 1
[All AWS Certified Developer Associate Questions]

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
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Suggested Answer: B 🗳️
by kapil206001 at Nov. 27, 2022, 6:59 a.m.
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kapil206001
Highly Voted 2 years, 4 months ago
B 4 KB/sec strong consistent read requires 1 RCU. So 10 KB data requires 3 RCU . Since 10 reads required each sec = 30 RCU 1 KB transactional write requires 2 WCU per second . Since 10 KB size so 20 WCU each sec for 1 write . FOr 2 Wrties = 40 WCU
upvoted 6 times
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pancman
Highly Voted 2 years, 2 months ago
Selected Answer: B
Here is how to calculate read capacity units: Divide item size by 4 KB and round up the result: 10 KB / 4 KB = 2.5 --> round up to 3 So we need 3 RCUs for each item. Since we need to read 10 items every second: 10 x 3 = 30 RCUs needed for reading
upvoted 5 times
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rcaliandro
Most Recent 1 year, 9 months ago
B is the correct option
upvoted 1 times
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hpipit
2 years, 3 months ago
Selected Answer: B
B is correct
upvoted 1 times
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k1kavi1
2 years, 4 months ago
Selected Answer: B
https://www.examtopics.com/discussions/amazon/view/28706-exam-aws-certified-developer-associate-topic-1-question-266/
upvoted 3 times
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