DBS-C01 Management and Operations Practice Question
A company has an Amazon DynamoDB table that stores session data for a web application. The table's read capacity units (RCUs) are consistently near 100% utilization during peak hours, causing throttling. The application can tolerate eventually consistent reads. Which action should the application team take to reduce throttling?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the read consistency to eventually consistent.
Eventually consistent reads consume only half the Read Capacity Units (RCUs) compared to strongly consistent reads. Switching to eventually consistent reads effectively doubles the read capacity, reducing throttling without additional cost. Option A is incorrect because decreasing provisioned RCUs would reduce capacity and worsen throttling. Option B is incorrect because while DAX can cache session data and reduce read load on the table, it does not directly address the RCU consumption for reads that still hit the table; moreover, implementing DAX adds complexity and cost. Option D is incorrect because increasing RCUs would solve throttling but at a higher cost, whereas eventually consistent reads provide a cost-effective solution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Decrease the provisioned RCUs for the table.
Why it's wrong here
Decreasing RCUs would reduce capacity and exacerbate throttling, not solve it.
- ✗
Enable DynamoDB Accelerator (DAX) to cache the session data.
Why it's wrong here
DAX can reduce read load by caching, but it does not directly reduce RCU consumption for reads that still hit the table, and it adds complexity.
- ✓
Change the read consistency to eventually consistent.
Why this is correct
Using eventually consistent reads halves RCU consumption, doubling effective read capacity and reducing throttling.
- ✗
Increase the provisioned RCUs for the table.
Why it's wrong here
Increasing RCUs would solve throttling but at higher cost; eventually consistent reads achieve the same effect without additional expense.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.