The correct answer is to update the CloudFormation stack with the new instance class and apply the change, because Amazon RDS supports modifying the DB instance class in-place without recreating the database. When you update the DBInstanceClass property in the template and run a stack update, CloudFormation triggers an RDS modification that applies the new class during the next maintenance window or immediately if you choose to apply now, causing a brief downtime but preserving all data and endpoints. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of CloudFormation stack updates versus replacement behaviors, and the common trap is assuming that any change to the instance class forces a recreation—RDS’s native modify-instance operation avoids this. A key memory tip is: “Class change, no exchange”—the instance class can be swapped without swapping the database itself.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 AWS CloudFormation to deploy a stack that includes an Amazon RDS MySQL instance. The stack template defines the DBInstanceClass as db.t3.medium. After deployment, the database performance is insufficient for the workload. The company wants to change the instance class to db.r5.large without recreating the database. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the CloudFormation stack with the new instance class and apply the change.
Option B is correct because RDS supports modifying the DB instance class without recreating the database; the update will cause a brief downtime but preserves data. Option A is wrong because deleting the stack would destroy the database. Option C is wrong because creating a new stack would create a new database, not modify the existing one. Option D is wrong because RDS does not support blue/green deployments for instance class changes as a standard feature.
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 a new stack with the new instance class and migrate the data.
Why it's wrong here
Data migration is unnecessary and time-consuming.
✗
Use AWS Database Migration Service to perform a blue/green deployment.
Why it's wrong here
DMS is for migrations, not for changing instance class of an existing DB.
✗
Delete the stack and create a new one with the new instance class.
Why it's wrong here
This deletes the database and all data.
✓
Update the CloudFormation stack with the new instance class and apply the change.
Why this is correct
CloudFormation will modify the DB instance in-place with minimal downtime.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Update the CloudFormation stack with the new instance class and apply the change. — Option B is correct because RDS supports modifying the DB instance class without recreating the database; the update will cause a brief downtime but preserves data. Option A is wrong because deleting the stack would destroy the database. Option C is wrong because creating a new stack would create a new database, not modify the existing one. Option D is wrong because RDS does not support blue/green deployments for instance class changes as a standard feature.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 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.
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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