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Workload-Specific Database Design →easyMultiple ChoiceObjective-mapped

DBS-C01 Workload-Specific Database Design Practice Question

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?

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 provides flexible schemas (schema-less tables) ideal for user profiles that may vary in attributes, supports high read throughput via auto-scaling and DAX caching, and offers strongly consistent reads (when requested) to ensure friend requests are processed reliably. Its fully managed nature and single-digit millisecond latency align with the startup's need for a scalable, consistent database.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 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

    Read the scenario before looking for a memorised answer.

  • ✗

    Amazon DocumentDB

    Why it's wrong here

    DocumentDB is document-oriented but may have higher latency for strongly consistent reads.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may choose Amazon Neptune for social features due to its graph capabilities, overlooking that DynamoDB can handle simple social relationships with strong consistency and lower operational overhead, while Neptune's eventual consistency and complexity are mismatched for this use case.

Detailed technical explanation

How to think about this question

DynamoDB achieves strong consistency by reading from the leader replica in its multi-AZ storage, ensuring the most recent write is returned, though this consumes twice the read capacity units (RCUs) compared to eventual consistency. For friend requests, a conditional write (e.g., 'attribute_not_exists') can prevent duplicate requests, leveraging DynamoDB's atomicity. In practice, startups often use DynamoDB with a composite primary key (e.g., user_id + friend_id) to model friend relationships efficiently.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DBS-C01 question test?

Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Amazon DynamoDB — Amazon DynamoDB is the correct choice because it provides flexible schemas (schema-less tables) ideal for user profiles that may vary in attributes, supports high read throughput via auto-scaling and DAX caching, and offers strongly consistent reads (when requested) to ensure friend requests are processed reliably. Its fully managed nature and single-digit millisecond latency align with the startup's need for a scalable, consistent database.

What should I do if I get this DBS-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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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.