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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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 runs an online auction platform on AWS. The application uses Amazon DynamoDB as the primary database, with a table 'Auctions' that has a partition key 'auction_id' (String) and sort key 'end_time' (Number). The table also has a global secondary index (GSI) on 'status' (String) and 'current_bid' (Number). The application frequently queries for active auctions sorted by current bid. Recently, the team noticed that queries on the GSI for active auctions with a high current_bid are returning results slowly. The DynamoDB table has 10,000 write capacity units (WCU) and 30,000 read capacity units (RCU) provisioned. The GSI has 5,000 RCU provisioned. The team suspects throttling on the GSI. What is the most likely cause of the slow queries?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

A
The GSI's provisioned RCU is insufficient due to hot partitions.
Hot partitions can throttle even if total RCU is not fully used.
B
The GSI key schema is inefficient for the query pattern.
Why wrong: The schema is appropriate; throttling is the issue.
C
The table's WCU is too low, causing throttling on writes that affects reads.
Why wrong: Write throttling does not directly cause read throttling on index.
D
The table's RCU is too low for the application's read load.
Why wrong: Table RCU is separate from index RCU.

Full breakdown with real-world context →

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

✓

The GSI's provisioned RCU is insufficient due to hot partitions.

Option A is correct. The GSI has 5,000 RCU provisioned, but if the GSI's partition key (status) and sort key (current_bid) lead to a hot partition—for example, many active auctions have the same status and similar current_bid—that single partition can throttle even if the total RCU is not fully utilized. This is because DynamoDB distributes RCU evenly across partitions, and a hot partition can exceed its allocated RCU, causing throttling on that partition. Option B is incorrect because the index key schema (status, current_bid) is actually appropriate for querying active auctions sorted by current bid; the issue is hot partitions, not inefficiency. Option C is incorrect because WCU throttling does not directly affect read performance on the GSI. Option D is incorrect because the table's RCU is separate from the index's RCU, and the index's RCU is the relevant factor.

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.

✓
The GSI's provisioned RCU is insufficient due to hot partitions.
Why this is correct
Hot partitions can throttle even if total RCU is not fully used.
Clue confirmation
The clue words "most likely", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The GSI key schema is inefficient for the query pattern.
Why it's wrong here
The schema is appropriate; throttling is the issue.
✗
The table's WCU is too low, causing throttling on writes that affects reads.
Why it's wrong here
Write throttling does not directly cause read throttling on index.
✗
The table's RCU is too low for the application's read load.
Why it's wrong here
Table RCU is separate from index RCU.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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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: The GSI's provisioned RCU is insufficient due to hot partitions. — Option A is correct. The GSI has 5,000 RCU provisioned, but if the GSI's partition key (status) and sort key (current_bid) lead to a hot partition—for example, many active auctions have the same status and similar current_bid—that single partition can throttle even if the total RCU is not fully utilized. This is because DynamoDB distributes RCU evenly across partitions, and a hot partition can exceed its allocated RCU, causing throttling on that partition. Option B is incorrect because the index key schema (status, current_bid) is actually appropriate for querying active auctions sorted by current bid; the issue is hot partitions, not inefficiency. Option C is incorrect because WCU throttling does not directly affect read performance on the GSI. Option D is incorrect because the table's RCU is separate from the index's RCU, and the index's RCU is the relevant factor.

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely", "primary". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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