Quick Answer
Amazon DynamoDB is the correct choice because it provides the flexible schema, high read throughput, and optional strong consistency required for a mobile app backend handling user profiles and social features. DynamoDB’s schema-less design allows each user profile to have different attributes, while its provisioned or on-demand throughput scales to meet high read demands, and its DynamoDB Consistent Read option ensures that friend requests return the most up-to-date data. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of when to choose a NoSQL key-value and document database over relational or specialized services—a common trap is selecting RDS MySQL for its ACID compliance, but that forces a fixed schema and struggles with high-volume, variable-attribute workloads. Remember the memory tip: “Flexible schema + strong consistency = DynamoDB’s dual mode,” contrasting with DocumentDB’s eventual consistency by default and Neptune’s graph-only focus.
This DBS-C01 practice question tests your understanding of workload-specific database design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A startup is building a mobile app backend with user profiles and social features. They need a database that can handle flexible schemas, high read throughput for user profiles, and strong consistency for friend requests. Which database service should they choose?
Amazon RDS for MySQL
Why wrong: RDS requires fixed schema and may not scale as easily for high throughput.
Amazon Neptune
Why wrong: Neptune is for graph data; not ideal for simple profile storage.
Amazon DynamoDB
DynamoDB provides flexible schema and high performance with strong consistency.
Amazon DocumentDB
Why wrong: DocumentDB is document-oriented but may have higher latency for strongly consistent reads.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon DynamoDB
Option C is correct because Amazon DynamoDB offers flexible schema, high throughput, and optional strong consistency. Option A (RDS MySQL) is relational with fixed schema. Option B (Neptune) is graph-dedicated. Option D (DocumentDB) is MongoDB-compatible but not as optimized for consistent low-latency reads across a wide range of access patterns.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon RDS for MySQL
Why it's wrong here
RDS requires fixed schema and may not scale as easily for high throughput.
Amazon Neptune
Why it's wrong here
Neptune is for graph data; not ideal for simple profile storage.
Amazon DynamoDB
Why this is correct
DynamoDB provides flexible schema and high performance with strong consistency.
Related concept
Static NAT maps one inside address to one outside address.
Amazon DocumentDB
Why it's wrong here
DocumentDB is document-oriented but may have higher latency for strongly consistent reads.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Workload-Specific Database Design — study guide chapter
Learn the concepts, then practise the questions
Workload-Specific Database Design practice questions
Targeted practice on this topic area only
All DBS-C01 questions
1,730 questions across all exam domains
AWS Certified Database Specialty DBS-C01 study guide
Full concept coverage aligned to exam objectives
DBS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise DBS-C01 questions linked to Workload-Specific Database Design.
Practise DBS-C01 questions linked to Deployment and Migration.
Practise DBS-C01 questions linked to Management and Operations.
Practise DBS-C01 questions linked to Monitoring and Troubleshooting.
Practise DBS-C01 questions linked to Database Security.
Practise DBS-C01 questions linked to DBS-C01 fundamentals.
Practise DBS-C01 questions linked to DBS-C01 scenario.
Practise DBS-C01 questions linked to DBS-C01 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Static NAT maps one inside address to one outside address..
The correct answer is: Amazon DynamoDB — Option C is correct because Amazon DynamoDB offers flexible schema, high throughput, and optional strong consistency. Option A (RDS MySQL) is relational with fixed schema. Option B (Neptune) is graph-dedicated. Option D (DocumentDB) is MongoDB-compatible but not as optimized for consistent low-latency reads across a wide range of access patterns.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 20, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.