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 uses Amazon RDS for MySQL with Multi-AZ deployment. During a recent failover, the application experienced a brief outage because it cached the old database endpoint. Which solution would minimize application disruption during future failovers?
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
✓
Use the RDS cluster endpoint in the application configuration.
The correct answer is D because the RDS cluster endpoint (also known as the writer endpoint) automatically points to the primary instance in a Multi-AZ deployment. During a failover, DNS is updated to resolve the cluster endpoint to the new primary instance, so the application does not need to cache or change the endpoint. This minimizes disruption by ensuring the application always connects to the current primary without manual intervention.
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 Amazon ElastiCache to cache database queries and absorb the failover delay.
Why it's wrong here
ElastiCache does not handle database endpoint failover; it only caches query results.
✗
Create a read replica in another Availability Zone and promote it during failover.
Why it's wrong here
Promotion requires manual intervention and does not provide automatic failover for the application.
✗
Configure the application to connect using the RDS instance's private IP address.
Why it's wrong here
IP addresses do not change automatically after failover; the application would need to reconnect to the new IP.
✓
Use the RDS cluster endpoint in the application configuration.
Why this is correct
The cluster endpoint automatically points to the current primary instance, enabling seamless failover.
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
The trap here is that candidates confuse the cluster endpoint with the instance endpoint or private IP, assuming that static IPs or read replicas provide better failover behavior, when in fact the cluster endpoint is specifically designed for automatic failover in Multi-AZ deployments.
Detailed technical explanation
How to think about this question
The RDS cluster endpoint uses a DNS CNAME record that is updated within 30-60 seconds after a failover to point to the new primary instance. Applications that cache DNS resolutions (e.g., with TTL settings) may still experience brief outages if they do not honor the TTL or use stale cached IPs. To fully minimize disruption, applications should use the cluster endpoint and configure DNS caching with a low TTL (e.g., 5 seconds) or use the AWS SDK's automatic retry and endpoint refresh logic.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 the RDS cluster endpoint in the application configuration. — The correct answer is D because the RDS cluster endpoint (also known as the writer endpoint) automatically points to the primary instance in a Multi-AZ deployment. During a failover, DNS is updated to resolve the cluster endpoint to the new primary instance, so the application does not need to cache or change the endpoint. This minimizes disruption by ensuring the application always connects to the current primary without manual intervention.
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.
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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