- A
Create one or more read replicas in the same region.
Read replicas handle read traffic, reducing load on the primary.
- B
Enable Multi-AZ deployment for automatic failover.
Why wrong: Multi-AZ improves availability, not read performance.
- C
Increase the allocated storage size to improve IOPS.
Why wrong: Storage size increase may not directly improve read performance.
- D
Enable Performance Insights to identify slow queries.
Performance Insights helps identify and optimize slow queries.
- E
Delete unnecessary indexes to reduce write overhead.
Why wrong: Deleting indexes may reduce write overhead but can hurt read performance.
Question 60 of 1,786
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 runs a production Amazon RDS for PostgreSQL database. The database is experiencing performance degradation due to a high number of concurrent read queries. The data engineer needs to improve read performance without significantly increasing costs. Which TWO actions should the engineer take? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create one or more read replicas in the same region.
Creating one or more read replicas in the same region offloads read traffic from the primary DB instance, directly addressing the high number of concurrent read queries. Read replicas are asynchronous copies that can serve SELECT traffic, improving read throughput without increasing the cost of the primary instance. This is a cost-effective scaling strategy because you pay only for the replica instances and can choose smaller instance sizes if read workloads are bursty.
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.
- ✓
Create one or more read replicas in the same region.
Why this is correct
Read replicas handle read traffic, reducing load on the primary.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable Multi-AZ deployment for automatic failover.
Why it's wrong here
Multi-AZ improves availability, not read performance.
- ✗
Increase the allocated storage size to improve IOPS.
Why it's wrong here
Storage size increase may not directly improve read performance.
- ✓
Enable Performance Insights to identify slow queries.
Why this is correct
Performance Insights helps identify and optimize slow queries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete unnecessary indexes to reduce write overhead.
Why it's wrong here
Deleting indexes may reduce write overhead but can hurt read performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Multi-AZ with read replicas, assuming the standby can serve reads, or they think increasing storage automatically improves IOPS and read performance without considering cost or the actual bottleneck.
Detailed technical explanation
How to think about this question
Amazon RDS read replicas use PostgreSQL's native streaming replication to maintain an asynchronous copy of the database. The replica can be promoted to a primary in case of failure, but during normal operation it can handle read traffic, reducing load on the source. Performance Insights, when enabled, captures database load metrics and wait events, allowing you to identify the specific queries causing contention (e.g., sequential scans, lock waits) and optimize them with indexing or query tuning.
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.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
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: Create one or more read replicas in the same region. — Creating one or more read replicas in the same region offloads read traffic from the primary DB instance, directly addressing the high number of concurrent read queries. Read replicas are asynchronous copies that can serve SELECT traffic, improving read throughput without increasing the cost of the primary instance. This is a cost-effective scaling strategy because you pay only for the replica instances and can choose smaller instance sizes if read workloads are bursty.
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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Last reviewed: Jul 4, 2026
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