The correct answer is that the output S3 bucket specified in the query result configuration already exists. This is because Athena requires the designated query result bucket to not exist prior to the first use; the service will automatically create the bucket for you when you run your first query, and if it finds an existing bucket with that name, it throws the error “Bucket should not exist.” On the AWS Certified Machine Learning Specialty MLS-C01 exam, this concept tests your understanding of Athena’s default behavior for result storage, often appearing as a trick where candidates assume any bucket name is valid. A common trap is to think the error relates to permissions or syntax, but the core issue is that Athena insists on creating the bucket itself to ensure proper ownership and configuration. Remember the mnemonic: “First run, bucket none” — if the bucket already exists, the query fails.
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. 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.
Network Topology
Refer to the exhibit. A data engineer runs an Athena query and gets a failure. What is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The output S3 bucket specified in the query result configuration already exists.
Option D is correct. The error message says 'Bucket my-query-results should not exist', which indicates that the output location bucket must not exist beforehand; Athena creates it if it doesn't exist. Option A is incorrect because the error does not mention permissions. Option B is incorrect because the error is about the bucket existing, not the query syntax. Option C is incorrect because the error does not mention encryption.
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 query result location uses a bucket with default encryption enabled.
Why it's wrong here
The error does not mention encryption.
✗
The SQL query syntax is incorrect.
Why it's wrong here
The error is not a syntax error; it's a runtime error about the output bucket.
✗
The IAM role used does not have permissions to write to S3.
Why it's wrong here
The error message does not indicate a permissions issue; it says the bucket should not exist.
✓
The output S3 bucket specified in the query result configuration already exists.
Why this is correct
Athena expects the output bucket to be created by the service; if it already exists, it may cause this error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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.
Trap categories for this question
Command / output trap
The error is not a syntax error; it's a runtime error about the output bucket.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which MLS-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.
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The output S3 bucket specified in the query result configuration already exists. — Option D is correct. The error message says 'Bucket my-query-results should not exist', which indicates that the output location bucket must not exist beforehand; Athena creates it if it doesn't exist. Option A is incorrect because the error does not mention permissions. Option B is incorrect because the error is about the bucket existing, not the query syntax. Option C is incorrect because the error does not mention encryption.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". 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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Question Discussion
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