The correct answer is to schedule a VACUUM command using a query scheduler like Amazon EventBridge. This approach automates Redshift VACUUM scheduling by running the maintenance operation during a defined low-activity window, preventing the gradual performance degradation caused by deleted or updated rows consuming storage space. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of automated maintenance strategies versus manual or disruptive fixes—a common trap is assuming that disabling auto vacuum or recreating tables solves the problem, but those either fail to automate or cause unnecessary downtime. Remember the key principle: for consistent performance, you must automate vacuum without manual intervention. Memory tip: think "EventBridge for VACUUM" to link scheduled events with table health.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 data engineer is optimizing an Amazon Redshift cluster that runs a nightly ETL workload. The engineer notices that the query performance degrades over the week and improves after a VACUUM operation. Which action should the engineer take to automate this maintenance and minimize impact on performance?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Schedule a VACUUM command using a query scheduler like Amazon EventBridge.
Option B is correct because automating VACUUM using a scheduled query (e.g., via Amazon EventBridge or Redshift's built-in scheduler) ensures regular maintenance without manual intervention. Option A is wrong because disabling auto vacuum does not automate it. Option C is wrong because dropping and recreating tables is disruptive. Option D is wrong because manual VACUUM is not automated.
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.
✗
Run VACUUM manually only when performance degrades significantly.
Why it's wrong here
Not automated, leads to performance degradation.
✗
Disable auto vacuum and run a manual VACUUM every night after the ETL.
Why it's wrong here
Manual VACUUM is not automated.
✓
Schedule a VACUUM command using a query scheduler like Amazon EventBridge.
Why this is correct
Automates the maintenance task.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Drop and recreate the tables weekly to avoid unsorted data.
Why it's wrong here
Disruptive and causes data loss if not managed carefully.
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 DEA-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 Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Schedule a VACUUM command using a query scheduler like Amazon EventBridge. — Option B is correct because automating VACUUM using a scheduled query (e.g., via Amazon EventBridge or Redshift's built-in scheduler) ensures regular maintenance without manual intervention. Option A is wrong because disabling auto vacuum does not automate it. Option C is wrong because dropping and recreating tables is disruptive. Option D is wrong because manual VACUUM is not automated.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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