The correct answer is to refresh the materialized views that the queries are using. This is necessary because Amazon Redshift does not automatically propagate changes from base tables to materialized views; a materialized view refresh must be explicitly run to incorporate the latest source data and fix stale data. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of Redshift’s materialized view behavior versus common misconceptions—many candidates mistakenly choose VACUUM or ANALYZE, but those commands only manage storage and statistics, not view content. A frequent trap is assuming Redshift auto-refreshes views like a traditional OLTP database, but in Redshift, you must schedule or manually trigger a refresh. Memory tip: think “MV = Manual View” to remember that materialized views require an explicit refresh to stay current.
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 company uses Amazon Redshift for its data warehouse. During a routine audit, the data engineer discovers that some queries are returning stale data even though the underlying source data has been updated. The engineer confirms that the COPY command completes successfully and that no errors are reported. Which action should the engineer take to ensure queries reflect the latest data?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Refresh the materialized views that the queries are using.
Option B is correct because Redshift does not automatically maintain materialized views; they need to be refreshed to reflect changes in the base tables. Option A is wrong because Redshift does not have a cache that needs clearing in this context. Option C is wrong because VACUUM reclaims space and sorts tables, but does not refresh materialized views. Option D is wrong because ANALYZE updates statistics, not the data content.
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 the VACUUM command on the source tables.
Why it's wrong here
VACUUM reorganizes data but does not update materialized views.
✗
Clear the Redshift result cache by running RESET ALL.
Why it's wrong here
Result cache is for repeated queries, not for materialized views.
✗
Run the ANALYZE command on the source tables.
Why it's wrong here
ANALYZE updates statistics, not the data in materialized views.
✓
Refresh the materialized views that the queries are using.
Why this is correct
Materialized views must be refreshed to reflect changes in base tables.
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.
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: Refresh the materialized views that the queries are using. — Option B is correct because Redshift does not automatically maintain materialized views; they need to be refreshed to reflect changes in the base tables. Option A is wrong because Redshift does not have a cache that needs clearing in this context. Option C is wrong because VACUUM reclaims space and sorts tables, but does not refresh materialized views. Option D is wrong because ANALYZE updates statistics, not the data content.
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.
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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