- A
Enable Multi-AZ on the RDS instance to allow failover during updates.
Why wrong: Multi-AZ provides high availability but not zero-downtime updates.
- B
Update the CloudFormation stack directly without creating a new database.
Why wrong: Direct updates may cause downtime.
- C
Use AWS CloudFormation with a blue/green deployment strategy for the database.
Blue/green allows you to create a new database and switch traffic.
- D
Use a read replica to serve traffic during the update.
Why wrong: Read replicas are for read traffic, not for write updates.
- E
Use a database snapshot to restore the database if the update fails.
Snapshots provide a rollback mechanism.
Question 775 of 1,746
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company uses AWS CloudFormation to deploy a multi-tier application. The deployment includes an Application Load Balancer, Auto Scaling group, and Amazon RDS database. The company wants to ensure that updates to the database do not cause downtime. Which TWO strategies should the company use? (Choose two.)
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
✓
Use AWS CloudFormation with a blue/green deployment strategy for the database.
Option C is correct because CloudFormation can use a blue/green deployment strategy, which creates a new database environment (green) alongside the existing one (blue). Traffic is switched after the new environment is ready, minimizing downtime. Option E is correct because taking a database snapshot before updates provides a rollback mechanism in case the update fails. Option A is wrong: Multi-AZ provides high availability and automatic failover but does not eliminate downtime during updates—it simply recovers quickly after an outage. Option B is wrong: Directly updating the CloudFormation stack without creating a new database may cause downtime if the database must be replaced or modified in place. Option D is wrong: A read replica serves only read traffic; it cannot handle write traffic during database updates, so it does not prevent downtime for write operations.
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.
- ✗
Enable Multi-AZ on the RDS instance to allow failover during updates.
Why it's wrong here
Multi-AZ provides high availability but not zero-downtime updates.
- ✗
Update the CloudFormation stack directly without creating a new database.
Why it's wrong here
Direct updates may cause downtime.
- ✓
Use AWS CloudFormation with a blue/green deployment strategy for the database.
Why this is correct
Blue/green allows you to create a new database and switch traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a read replica to serve traffic during the update.
Why it's wrong here
Read replicas are for read traffic, not for write updates.
- ✓
Use a database snapshot to restore the database if the update fails.
Why this is correct
Snapshots provide a rollback mechanism.
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 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.
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Continuous Improvement for Existing Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
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: Use AWS CloudFormation with a blue/green deployment strategy for the database. — Option C is correct because CloudFormation can use a blue/green deployment strategy, which creates a new database environment (green) alongside the existing one (blue). Traffic is switched after the new environment is ready, minimizing downtime. Option E is correct because taking a database snapshot before updates provides a rollback mechanism in case the update fails. Option A is wrong: Multi-AZ provides high availability and automatic failover but does not eliminate downtime during updates—it simply recovers quickly after an outage. Option B is wrong: Directly updating the CloudFormation stack without creating a new database may cause downtime if the database must be replaced or modified in place. Option D is wrong: A read replica serves only read traffic; it cannot handle write traffic during database updates, so it does not prevent downtime for write operations.
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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Last reviewed: Jun 20, 2026
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