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Workload-Specific Database Design →hardMultiple 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 company has an Amazon RDS for PostgreSQL instance that is running out of storage. The database is 2 TB in size and growing at 10 GB per day. They need a solution that allows automatic storage scaling with minimal downtime. What should they do?

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

✓

Enable Storage Auto Scaling

Amazon RDS Storage Auto Scaling automatically increases storage when free space drops below a threshold, with no downtime. For a 2 TB database growing at 10 GB/day, this feature dynamically adds storage in predefined increments (e.g., 5 GB, 10 GB, or 10% of current storage) up to the maximum limit, preventing manual intervention. This directly addresses the requirement for automatic scaling with minimal disruption.

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.

  • ✓

    Enable Storage Auto Scaling

    Why this is correct

    Automatically scales storage with no downtime.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Purchase reserved instances for cost savings

    Why it's wrong here

    Does not address storage shortage.

  • ✗

    Create a read replica and promote it

    Why it's wrong here

    Doesn't solve storage growth.

  • ✗

    Take a manual snapshot and restore to a larger instance

    Why it's wrong here

    Causes downtime during restore.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse storage scaling with compute scaling or failover strategies, assuming that a read replica or snapshot restore is required for storage growth, when RDS Storage Auto Scaling handles it automatically and transparently.

Detailed technical explanation

How to think about this question

RDS Storage Auto Scaling uses a policy that triggers when free storage falls below 10% of allocated storage or when the low storage condition persists for 6 minutes. It adds storage in increments of 5 GB, 10 GB, or 10% of current allocated storage (whichever is greater), up to the maximum limit for the instance class. This feature is particularly useful for workloads with unpredictable growth patterns, as it avoids the need to manually monitor and modify storage settings.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

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: Enable Storage Auto Scaling — Amazon RDS Storage Auto Scaling automatically increases storage when free space drops below a threshold, with no downtime. For a 2 TB database growing at 10 GB/day, this feature dynamically adds storage in predefined increments (e.g., 5 GB, 10 GB, or 10% of current storage) up to the maximum limit, preventing manual intervention. This directly addresses the requirement for automatic scaling with minimal disruption.

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.