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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. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 social media startup is selecting a database for user profiles with a flexible schema and high write throughput. The application is built on Node.js and requires low-latency access. Which database 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 is a fully managed NoSQL key-value and document database that offers flexible schema (schemaless), single-digit millisecond latency at any scale, and is designed for high write throughput. It integrates natively with Node.js via the AWS SDK and supports auto-scaling to handle unpredictable write loads, making it ideal for a social media startup's user profile store.

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 Aurora

    Why it's wrong here

    Relational, not flexible schema.

  • ✗

    Amazon ElastiCache for Redis

    Why it's wrong here

    In-memory cache, not a durable database.

  • ✗

    Amazon RDS for MySQL

    Why it's wrong here

    Relational, rigid schema.

  • ✓

    Amazon DynamoDB

    Why this is correct

    NoSQL, flexible schema, high throughput.

    Related concept

    Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse ElastiCache for Redis (Option B) as a primary database due to its low latency, but it is an in-memory cache lacking durability and flexible schema, whereas DynamoDB provides both low latency and persistent storage with a schemaless design.

Detailed technical explanation

How to think about this question

DynamoDB achieves low-latency writes through its distributed architecture, where data is partitioned across multiple nodes using a hash of the partition key, and writes are replicated across three Availability Zones for durability. The flexible schema is inherent to NoSQL, allowing each item to have different attributes without predefined columns, which is critical for user profiles that may evolve over time. In a real-world scenario, a social media startup might store user preferences, bios, and profile pictures as varying attribute sets, and DynamoDB's auto-scaling can handle spikes in write traffic during viral events without manual intervention.

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 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

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 is a fully managed NoSQL key-value and document database that offers flexible schema (schemaless), single-digit millisecond latency at any scale, and is designed for high write throughput. It integrates natively with Node.js via the AWS SDK and supports auto-scaling to handle unpredictable write loads, making it ideal for a social media startup's user profile store.

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.