DBS-C01 Workload-Specific Database Design Practice Question
A company needs to store JSON documents that are up to 10 KB in size. The documents are accessed by a primary key, and the company requires single-digit millisecond latency. Which database service should be used?
⚠ Common exam trap
Candidates often choose Amazon RDS for MySQL with JSON data type because they assume a relational database can handle JSON efficiently, but they overlook the inherent latency overhead of relational engines and the fact that DynamoDB is purpose-built for single-digit millisecond key-value access at any scale.
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
✓
Amazon DynamoDB
Amazon DynamoDB is the correct choice because it is a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale. It natively supports JSON documents up to 400 KB in size (well above the 10 KB requirement) and provides primary key access with consistent low-latency performance, making it ideal for this workload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Neptune
Why it's wrong here
Graph database, not for simple key-value.
- ✓
Amazon DynamoDB
Why this is correct
Provides single-digit ms latency for key-value access.
- ✗
Amazon S3
Why it's wrong here
Higher latency (tens of ms).
- ✗
Amazon RDS for MySQL with JSON data type
Why it's wrong here
May have higher latency under load.
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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.