DBS-C01 Workload-Specific Database Design Practice Question
A startup is building a mobile application that needs to store user profiles and preferences. The data is schema-less and will grow rapidly. The application requires single-digit millisecond latency for reads and writes. Which AWS database should they choose?
⚠ Common exam trap
A common mix-up: candidates confuse relational databases like Aurora or RDS with NoSQL requirements, assuming that any 'fast' database can handle schema-less data, but DynamoDB's key-value design and automatic scaling are specifically required for this use case.
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 a fully managed NoSQL key-value and document database that delivers single-digit millisecond latency at any scale. It is schema-less, making it ideal for storing user profiles and preferences that have varying attributes, and it automatically scales to handle rapid growth without downtime or performance degradation.
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 Aurora (MySQL compatible)
Why it's wrong here
Aurora is relational and requires schema definition.
- ✗
Amazon Redshift
Why it's wrong here
Redshift is a data warehouse not designed for real-time transactional workloads.
- ✗
Amazon RDS for SQL Server
Why it's wrong here
RDS SQL Server is relational and not as scalable for schema-less data.
- ✓
Amazon DynamoDB
Why this is correct
DynamoDB supports schema-less design and low-latency access.
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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.