- A
SnapshotUpdate
Correct. SnapshotUpdate is the only update policy applicable to RDS instances. It takes a snapshot before the update, providing a rollback option and minimizing risk, though not downtime directly.
- B
AutoScalingReplacingUpdate
Why wrong: Incorrect. AutoScalingReplacingUpdate is designed for Auto Scaling groups and cannot be used with RDS DB instances in CloudFormation.
- C
ReplacingUpdate
Why wrong: Incorrect. ReplacingUpdate is not a named update policy in CloudFormation; it's the default behavior for resources that require replacement. For RDS, using default replacement causes downtime and is not the best choice.
- D
AutoScalingRollingUpdate
Why wrong: Incorrect. AutoScalingRollingUpdate is for Auto Scaling groups and does not apply to RDS instances.
Update Policy for RDS — Minimize Downtime on Replacement
This DVA-C02 practice question tests your understanding of deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cloudFormation Update Policies. 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 team uses AWS CloudFormation to manage infrastructure. They want to update a stack that contains an Amazon RDS database. During the update, they need to modify the DB instance class. Which update policy should they use 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 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
SnapshotUpdate
For an Amazon RDS DB instance in a CloudFormation stack, the appropriate update policy to minimize downtime during a DB instance class modification is SnapshotUpdate. This policy takes a snapshot of the existing database before applying the update, which enables a backup for recovery. While it does not eliminate downtime completely, it is the only update policy available for RDS instances among the options. AutoScalingReplacingUpdate (option B) is designed for Auto Scaling groups only and cannot be applied to RDS. ReplacingUpdate (option C) and AutoScalingRollingUpdate (option D) are also not applicable to RDS or would cause more downtime. Thus, SnapshotUpdate is the best choice.
Key principle: CloudFormation Update Policies
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SnapshotUpdate
Why this is correct
Correct. SnapshotUpdate is the only update policy applicable to RDS instances. It takes a snapshot before the update, providing a rollback option and minimizing risk, though not downtime directly.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
CloudFormation Update Policies
- ✗
AutoScalingReplacingUpdate
Why it's wrong here
Incorrect. AutoScalingReplacingUpdate is designed for Auto Scaling groups and cannot be used with RDS DB instances in CloudFormation.
- ✗
ReplacingUpdate
Why it's wrong here
Incorrect. ReplacingUpdate is not a named update policy in CloudFormation; it's the default behavior for resources that require replacement. For RDS, using default replacement causes downtime and is not the best choice.
- ✗
AutoScalingRollingUpdate
Why it's wrong here
Incorrect. AutoScalingRollingUpdate is for Auto Scaling groups and does not apply to RDS instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly think AutoScalingReplacingUpdate can be applied to RDS instances. In reality, that policy is exclusive to Auto Scaling groups. For RDS, the applicable update policy is SnapshotUpdate, which takes a snapshot before the update to provide a recovery point.
Detailed technical explanation
How to think about this question
Under the hood, CloudFormation's AutoScalingReplacingUpdate policy works by creating a new Auto Scaling group and gradually shifting traffic, but for RDS, a DB instance class change typically requires a reboot (downtime) unless using Multi-AZ with a failover. In practice, to minimize downtime for RDS instance class changes, you would enable Multi-AZ and perform a manual modification with immediate failover, or use blue/green deployments via RDS Blue/Green Deployments (which is not a CloudFormation update policy). The exam expects you to know that AutoScalingReplacingUpdate is the only policy among the options that supports a rolling replacement to reduce downtime, even though it is not the ideal solution for standalone RDS.
KKey Concepts to Remember
- CloudFormation Update Policies
- SnapshotUpdate
- RDS DB Instance Class Modification
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 Update Policies
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 Update Policies 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 Update Policies, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — CloudFormation Update Policies.
What is the correct answer to this question?
The correct answer is: SnapshotUpdate — For an Amazon RDS DB instance in a CloudFormation stack, the appropriate update policy to minimize downtime during a DB instance class modification is SnapshotUpdate. This policy takes a snapshot of the existing database before applying the update, which enables a backup for recovery. While it does not eliminate downtime completely, it is the only update policy available for RDS instances among the options. AutoScalingReplacingUpdate (option B) is designed for Auto Scaling groups only and cannot be applied to RDS. ReplacingUpdate (option C) and AutoScalingRollingUpdate (option D) are also not applicable to RDS or would cause more downtime. Thus, SnapshotUpdate is the best choice.
What should I do if I get this DVA-C02 question wrong?
Review cloudFormation Update Policies, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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?
CloudFormation Update Policies
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Last reviewed: Jul 4, 2026
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