The answer is choosing the right distribution style, sort keys, and compression encoding. These three elements directly control how data is physically organized and accessed within the cluster, minimizing data movement between nodes and reducing the amount of data scanned per query. Distribution style determines where data is placed, sort keys define the physical order for efficient range-restricted scans, and compression encoding reduces storage footprint and I/O. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of physical database design versus operational defaults; a common trap is confusing columnar storage or automatic vacuuming with manual performance tuning, as those are inherent or automated features. Remember that reserved instances affect cost, not query speed. A helpful memory tip is the "Three Pillars of Redshift Performance": Distribute, Sort, Compress.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 is migrating a large Oracle data warehouse to Amazon Redshift. Which THREE considerations are important for optimizing the Redshift cluster?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Defining appropriate sort keys for the tables.
Distribution style, sort keys, and compression encoding are key to Redshift performance. Columnar storage is inherent. Auto Vacuum is automatic. Reserved instances are for cost savings, not performance.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Purchasing reserved instances for the cluster.
Why it's wrong here
Cost savings, not performance optimization.
✗
Using columnar storage format.
Why it's wrong here
Redshift uses columnar storage by default; no special action needed.
✓
Defining appropriate sort keys for the tables.
Why this is correct
Improves query performance by reducing scans.
Related concept
Standard ACLs match source addresses.
✓
Applying compression encoding to columns.
Why this is correct
Reduces storage and improves I/O.
Related concept
Standard ACLs match source addresses.
✓
Choosing the right distribution style (KEY, ALL, EVEN).
Why this is correct
Affects data distribution across nodes.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Store Management — This question tests Data Store Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Defining appropriate sort keys for the tables. — Distribution style, sort keys, and compression encoding are key to Redshift performance. Columnar storage is inherent. Auto Vacuum is automatic. Reserved instances are for cost savings, not performance.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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