- A
Stop the RDS instance, then update the stack, then start it.
Why wrong: Wrong: Stopping the DB instance does not help because CloudFormation updates require the instance to be in a specific state; also, stopping an RDS instance may not be possible or allowed in all configurations.
- B
Add the 'AllowMajorVersionUpgrade' property to the DB instance in the template and update the stack.
Why wrong: Wrong: 'AllowMajorVersionUpgrade' is a property for database engine version upgrades, not for changing the instance class.
- C
Modify the CloudFormation template to change the 'DBInstanceClass' property and set 'UpdateReplacePolicy' to 'Snapshot', then update the stack. This will create a new DB instance and delete the old one after taking a snapshot.
Why wrong: Wrong: 'UpdateReplacePolicy' is not a valid CloudFormation property. The correct approach would be to use 'DeletionPolicy: Snapshot' to force replacement and preserve data, but as written the option would cause a stack update failure.
- D
Delete the CloudFormation stack, create a new stack with the new instance type, and restore from the automated backup.
Correct: Deleting the stack removes the DB instance, but automated backups are retained. You can create a new stack with the desired instance type and restore from the automated backup, achieving the goal without data loss.
DOP-C02 CloudFormation DeletionPolicy Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cloudFormation DeletionPolicy. 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 manage infrastructure. They have a stack that creates an Amazon RDS DB instance with automated backups enabled. The DevOps team needs to modify the DB instance to use a larger instance type. They update the CloudFormation template and execute a stack update. The update fails with the error: 'Cannot modify DB instance class because the instance is in a state that does not allow modification.' The DB instance is in the 'available' state. The team needs to successfully update the instance type without data loss. What should the team do?
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
Delete the CloudFormation stack, create a new stack with the new instance type, and restore from the automated backup.
Option D is correct because deleting the CloudFormation stack removes the DB instance, but automated backups are retained for the backup retention period. You can then create a new stack with the desired instance type and restore from the automated backup, preserving all data. Option A is wrong because stopping a DB instance does not change its state for modification; RDS instances can only be stopped if not in a Multi-AZ configuration, and CloudFormation updates are not designed for external state changes. Option B is wrong because 'AllowMajorVersionUpgrade' applies to engine version upgrades, not instance class changes. Option C is wrong because 'UpdateReplacePolicy' is not a valid CloudFormation resource property; the correct way to force replacement with a snapshot is to use 'DeletionPolicy: Snapshot' in the template, but the option as written would cause an error.
Key principle: CloudFormation DeletionPolicy
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Stop the RDS instance, then update the stack, then start it.
Why it's wrong here
Wrong: Stopping the DB instance does not help because CloudFormation updates require the instance to be in a specific state; also, stopping an RDS instance may not be possible or allowed in all configurations.
- ✗
Add the 'AllowMajorVersionUpgrade' property to the DB instance in the template and update the stack.
Why it's wrong here
Wrong: 'AllowMajorVersionUpgrade' is a property for database engine version upgrades, not for changing the instance class.
- ✗
Modify the CloudFormation template to change the 'DBInstanceClass' property and set 'UpdateReplacePolicy' to 'Snapshot', then update the stack. This will create a new DB instance and delete the old one after taking a snapshot.
Why it's wrong here
Wrong: 'UpdateReplacePolicy' is not a valid CloudFormation property. The correct approach would be to use 'DeletionPolicy: Snapshot' to force replacement and preserve data, but as written the option would cause a stack update failure.
- ✓
Delete the CloudFormation stack, create a new stack with the new instance type, and restore from the automated backup.
Why this is correct
Correct: Deleting the stack removes the DB instance, but automated backups are retained. You can create a new stack with the desired instance type and restore from the automated backup, achieving the goal without data loss.
Related concept
CloudFormation DeletionPolicy
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that 'UpdateReplacePolicy' does not exist; candidates may assume it is a valid property similar to 'DeletionPolicy'.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CloudFormation DeletionPolicy
- RDS Automated Backups
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
CloudFormation DeletionPolicy
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. CloudFormation DeletionPolicy 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.
Review cloudFormation DeletionPolicy, then practise related DOP-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — CloudFormation DeletionPolicy.
What is the correct answer to this question?
The correct answer is: Delete the CloudFormation stack, create a new stack with the new instance type, and restore from the automated backup. — Option D is correct because deleting the CloudFormation stack removes the DB instance, but automated backups are retained for the backup retention period. You can then create a new stack with the desired instance type and restore from the automated backup, preserving all data. Option A is wrong because stopping a DB instance does not change its state for modification; RDS instances can only be stopped if not in a Multi-AZ configuration, and CloudFormation updates are not designed for external state changes. Option B is wrong because 'AllowMajorVersionUpgrade' applies to engine version upgrades, not instance class changes. Option C is wrong because 'UpdateReplacePolicy' is not a valid CloudFormation resource property; the correct way to force replacement with a snapshot is to use 'DeletionPolicy: Snapshot' in the template, but the option as written would cause an error.
What should I do if I get this DOP-C02 question wrong?
Review cloudFormation DeletionPolicy, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CloudFormation DeletionPolicy
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Last reviewed: Jun 20, 2026
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