DBS-C01 Deployment and Migration Practice Question
A company is deploying Amazon DynamoDB for a new application. The application requires single-digit millisecond latency for read operations. Which DynamoDB feature should be configured to meet this requirement?
⚠ Common exam trap
Many exam-takers confuse DynamoDB Streams (a change-data-capture feature) with a performance optimization tool, or assume Auto Scaling directly reduces latency when it only manages throughput capacity.
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
✓
DynamoDB Accelerator (DAX)
DynamoDB Accelerator (DAX) is an in-memory caching service that sits between your application and DynamoDB, providing microsecond to single-digit millisecond latency for read-heavy workloads. By caching frequently accessed items, DAX offloads read traffic from the underlying DynamoDB tables, ensuring consistent low-latency responses even under high concurrency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DynamoDB Accelerator (DAX)
Why this is correct
DAX provides in-memory caching for fast reads.
- ✗
DynamoDB Streams
Why it's wrong here
Streams capture table activity, not improve read latency.
- ✗
Auto Scaling
Why it's wrong here
Auto Scaling adjusts capacity, not latency.
- ✗
Time to Live (TTL)
Why it's wrong here
TTL automatically deletes expired items.
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JA
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.