The correct answer is to define distribution style KEY on join keys, define SORT KEYs on columns used in WHERE clauses, and apply compression to all columns. These three design decisions work together to minimize data movement and maximize query performance: distribution KEY collocates related rows across nodes to avoid shuffling during joins, SORT KEYs enable zone maps to skip irrelevant blocks during scans, and compression reduces the amount of data read from disk, lowering I/O. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish optimal table design from common pitfalls—specifically, the trap of choosing ALL distribution (which duplicates data on every node) or relying on AUTO distribution, which may not suit high-traffic workloads. Remember the mnemonic “KSC” for Key, Sort, Compression—each addresses a different bottleneck: network, scan, and storage.
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 designing an Amazon Redshift data warehouse for a high-traffic analytics workload. The engineer needs to ensure fast query performance and minimize data movement. Which THREE design decisions should be made? (Choose THREE.)
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
✓
Choose DISTSTYLE KEY for tables that are frequently joined.
Options B, C, and D are correct. Distribution style KEY on join keys collocates data, sort keys on WHERE columns improve scan efficiency, and compression reduces I/O. Option A is wrong because ALL distribution stores copy on every node, increasing storage and load time. Option E is wrong because default distribution is AUTO, which may not be optimal.
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.
✓
Choose DISTSTYLE KEY for tables that are frequently joined.
Why this is correct
KEY distribution collocates rows based on join keys, reducing data movement.
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.
✗
Use the default distribution style for all tables.
Why it's wrong here
Default AUTO may not be optimal for performance.
✗
Use DISTSTYLE ALL for all large fact tables.
Why it's wrong here
ALL distributes entire table to all nodes, increasing storage and load time.
✓
Apply appropriate compression encodings to columns.
Why this is correct
Compression reduces storage and I/O.
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.
✓
Define SORT KEYs on columns used in WHERE clauses.
Why this is correct
Sort keys minimize scanning.
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.
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 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 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: Choose DISTSTYLE KEY for tables that are frequently joined. — Options B, C, and D are correct. Distribution style KEY on join keys collocates data, sort keys on WHERE columns improve scan efficiency, and compression reduces I/O. Option A is wrong because ALL distribution stores copy on every node, increasing storage and load time. Option E is wrong because default distribution is AUTO, which may not be optimal.
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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