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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 company uses Amazon DynamoDB to store session data for a web application. The table has a partition key of 'SessionId'. The company wants to automatically expire sessions after 1 hour. Which feature should be used?

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

✓

DynamoDB Time to Live (TTL)

DynamoDB Time to Live (TTL) is the correct choice because it allows you to define a per-item timestamp attribute (e.g., 'expireAt') that automatically deletes items after a specified duration—in this case, 1 hour. TTL operates at no additional cost, requires no custom code, and handles expiration asynchronously in the background, making it ideal for session data management.

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.

  • ✗

    DynamoDB Global Tables

    Why it's wrong here

    Global Tables replicate data, not expire.

  • ✗

    AWS Lambda function that scans the table every hour and deletes old items.

    Why it's wrong here

    Inefficient and costly.

  • ✗

    DynamoDB Streams

    Why it's wrong here

    Streams record changes, do not expire items.

  • ✓

    DynamoDB Time to Live (TTL)

    Why this is correct

    TTL automatically deletes expired items.

    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 may confuse DynamoDB Streams (which only tracks changes) with a mechanism that can automatically expire data, or they may over-engineer a solution with Lambda scans instead of using the simpler, native TTL feature.

Detailed technical explanation

How to think about this question

DynamoDB TTL works by evaluating the epoch time value stored in the designated TTL attribute (e.g., 'ttl') and deleting items once that timestamp is past. The deletion is typically performed within a few hours of the expiration time, but for session data, this delay is acceptable. TTL deletions are recorded in DynamoDB Streams if enabled, allowing you to trigger downstream actions (e.g., cleanup in a cache) without the overhead of a full scan.

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.

Visual reference

Client Server SYN (seq=100) SYN-ACK (seq=200, ack=101) ACK (ack=201) Connection established — data transfer begins

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: DynamoDB Time to Live (TTL) — DynamoDB Time to Live (TTL) is the correct choice because it allows you to define a per-item timestamp attribute (e.g., 'expireAt') that automatically deletes items after a specified duration—in this case, 1 hour. TTL operates at no additional cost, requires no custom code, and handles expiration asynchronously in the background, making it ideal for session data management.

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.