- A
Take a snapshot of the RDS database before the migration.
Allows restoration if migration fails.
- B
Use CloudFormation with a custom resource to run the migration.
Why wrong: This is possible but not a standard step for rollback.
- C
Use CodeDeploy's AppSpec file to run a migration script in the AfterInstall lifecycle hook.
CodeDeploy can execute scripts after installation.
- D
Use AWS Database Migration Service (DMS) to replicate the database continuously.
Why wrong: DMS is for ongoing replication, not for migration rollback.
- E
Configure the CodeDeploy deployment group to automatically roll back on failure.
Auto-rollback can restore the previous application version and trigger database restore.
Question 1,722 of 1,750
DOP-C02 SDLC Automation 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. 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 DevOps engineer is building a CI/CD pipeline for a PHP application that uses Amazon RDS for MySQL. The pipeline must run database migrations as part of the deployment. The team wants to ensure that if a migration fails, the deployment is rolled back and the database is restored to its previous state. Which THREE steps should the engineer implement?
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
✓
Take a snapshot of the RDS database before the migration.
Option A is correct because taking a manual snapshot of the RDS database before the migration provides a reliable restore point. If the migration fails, you can restore the database from this snapshot to its previous state, ensuring data integrity and enabling a clean rollback.
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.
- ✓
Take a snapshot of the RDS database before the migration.
Why this is correct
Allows restoration if migration fails.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use CloudFormation with a custom resource to run the migration.
Why it's wrong here
This is possible but not a standard step for rollback.
- ✓
Use CodeDeploy's AppSpec file to run a migration script in the AfterInstall lifecycle hook.
Why this is correct
CodeDeploy can execute scripts after installation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Database Migration Service (DMS) to replicate the database continuously.
Why it's wrong here
DMS is for ongoing replication, not for migration rollback.
- ✓
Configure the CodeDeploy deployment group to automatically roll back on failure.
Why this is correct
Auto-rollback can restore the previous application version and trigger database restore.
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 might think AWS DMS is suitable for rollback scenarios, but DMS is for ongoing replication, not for capturing a pre-migration state; the correct approach is to use RDS snapshots combined with CodeDeploy's automatic rollback feature.
Detailed technical explanation
How to think about this question
RDS snapshots are stored in Amazon S3 and capture the entire DB instance at a specific point in time, including all data and metadata. Restoring from a snapshot creates a new DB instance, so the rollback process must involve updating the application to point to the restored instance or using a DNS swap. In a CI/CD pipeline, you can automate the snapshot creation using the AWS CLI or SDK before running the migration script in the AfterInstall hook, and then trigger a CodeDeploy rollback if the migration fails.
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
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Take a snapshot of the RDS database before the migration. — Option A is correct because taking a manual snapshot of the RDS database before the migration provides a reliable restore point. If the migration fails, you can restore the database from this snapshot to its previous state, ensuring data integrity and enabling a clean rollback.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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