DBS-C01 Workload-Specific Database Design Practice Question
A company needs to store session data for millions of users with sub-millisecond latency. The data is key-value in nature and can tolerate eventual consistency. Which database service is best suited?
⚠ Common exam trap
Candidates often choose Amazon RDS for MySQL (Option C) because they associate MySQL with web applications and session storage, but they overlook the strict latency and scalability requirements that DynamoDB's distributed NoSQL architecture uniquely satisfies.
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 best choice because it is a fully managed NoSQL key-value and document database designed for single-digit millisecond latency at any scale, making it ideal for session data storage. It supports eventual consistency, which is acceptable for this use case, and can handle millions of users with sub-millisecond read and write performance using its SSD-backed storage and distributed architecture.
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 Redshift
Why it's wrong here
Data warehouse, not suitable for real-time session store.
- ✗
Amazon Neptune
Why it's wrong here
Graph database, not for key-value.
- ✗
Amazon RDS for MySQL
Why it's wrong here
Relational overhead and higher latency.
- ✓
Amazon DynamoDB
Why this is correct
Low-latency, scalable key-value store.
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