The correct answer is to modify the StorageType property in the CloudFormation template and perform a stack update, as this triggers an online modification that changes the RDS storage type from gp2 to io1 without replacing the database instance. This works because AWS RDS supports live modification of storage type, allowing the change to occur with minimal downtime while the database remains available. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this tests your understanding of CloudFormation update behaviors versus replacement policies, and a common trap is confusing DeletionPolicy or UpdateReplacePolicy with the actual property change needed—neither of those pseudo-parameters affect an in-place update. The key insight is that CloudFormation will automatically perform a no-downtime modification when the resource supports it, so you simply change the property and let the stack update handle the rest. Memory tip: "Modify, don't replace—RDS storage type changes are an in-place grace."
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 infrastructure. A Solutions Architect needs to update a stack that includes an RDS DB instance. The update requires modifying the DB instance's storage type from gp2 to io1. What change should be made to the CloudFormation template to minimize downtime?
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
✓
Modify the StorageType property in the CloudFormation template and perform a stack update.
Option B is correct because specifying 'UpdateReplacePolicy' does not exist; the correct approach is to allow modification of storage type without replacement. Option A is wrong because creating a new stack is unnecessary. Option C is wrong because DeletionPolicy affects stack deletion, not updates. Option D is correct because changing the 'StorageType' property in the template will trigger a modification that can be done online with minimal downtime.
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.
✓
Modify the StorageType property in the CloudFormation template and perform a stack update.
Why this is correct
Changing StorageType from gp2 to io1 is a supported modification that can be done without replacement, minimizing downtime.
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.
✗
Add an UpdateReplacePolicy attribute to the RDS resource.
Why it's wrong here
UpdateReplacePolicy is not a valid CloudFormation attribute; the correct attribute is DeletionPolicy.
✗
Create a new stack with the updated storage type and migrate data.
Why it's wrong here
This incurs more downtime and complexity than an in-place update.
✗
Set the DeletionPolicy to Retain for the RDS resource.
Why it's wrong here
DeletionPolicy controls what happens when the stack is deleted, not during updates.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Modify the StorageType property in the CloudFormation template and perform a stack update. — Option B is correct because specifying 'UpdateReplacePolicy' does not exist; the correct approach is to allow modification of storage type without replacement. Option A is wrong because creating a new stack is unnecessary. Option C is wrong because DeletionPolicy affects stack deletion, not updates. Option D is correct because changing the 'StorageType' property in the template will trigger a modification that can be done online with minimal downtime.
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.
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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