The answer is to use RA3 nodes with managed storage, which automatically offload cold data to Amazon S3 while keeping hot data on local SSD for fast queries. This is the most effective strategy because RA3 nodes decouple compute and storage, allowing the Redshift cluster to seamlessly move rarely accessed data to the lower-cost S3 tier without manual intervention or performance degradation for frequently queried datasets. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of Amazon Redshift’s managed storage architecture and cost optimization patterns—a common trap is selecting manual tiering or compression instead of the automatic RA3 offloading. Remember that RA3 nodes are purpose-built for this hot/cold separation, unlike older DC2 or DS2 nodes that require manual data lifecycle management. A simple memory tip: RA3 = Redshift Auto-offload to S3, keeping hot data on local SSD.
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 has an Amazon Redshift cluster with a mix of frequently accessed hot data and rarely accessed cold data. They want to reduce storage costs without affecting query performance for the hot data. Which strategy is MOST effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use RA3 nodes with managed storage to automatically offload cold data to Amazon S3.
RA3 nodes with managed storage automatically separate compute and storage, offloading cold data to Amazon S3 while keeping hot data on local SSD for fast queries. This reduces storage costs without manual intervention or affecting hot data performance.
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.
✓
Use RA3 nodes with managed storage to automatically offload cold data to Amazon S3.
Why this is correct
RA3 nodes use managed storage that automatically moves cold data to S3, reducing local storage costs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reduce the number of nodes and increase the number of slices.
Why it's wrong here
This reduces capacity and may degrade performance; does not address hot/cold separation.
✗
Create external tables in Redshift Spectrum to query cold data in S3.
Why it's wrong here
Spectrum allows querying S3 data but does not automatically manage hot/cold separation within the cluster.
✗
Use Dense Compute nodes and unload cold data to Amazon S3 manually.
Why it's wrong here
Manual unloading is not efficient and Dense Compute nodes have limited local storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Redshift Spectrum (Option C) thinking it automatically offloads cold data, but Spectrum requires manual external table creation and does not integrate with the cluster's automatic storage tiering.
Detailed technical explanation
How to think about this question
RA3 nodes use a managed storage layer that automatically moves data between local SSD (for hot data) and Amazon S3 (for cold data) based on access patterns, using a distributed storage engine. This is transparent to queries, as Redshift automatically retrieves cold data from S3 when needed, with minimal latency impact. In real-world scenarios, this eliminates the need for manual data lifecycle management and reduces total cost of ownership for mixed-access workloads.
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.
TExam Day Tips
→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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use RA3 nodes with managed storage to automatically offload cold data to Amazon S3. — RA3 nodes with managed storage automatically separate compute and storage, offloading cold data to Amazon S3 while keeping hot data on local SSD for fast queries. This reduces storage costs without manual intervention or affecting hot data performance.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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