- A
RDS will create a new DB instance with the new class and delete the old one.
Why wrong: RDS does not create a new instance for a class change; it modifies the existing instance.
- B
RDS will modify both instances simultaneously, causing a brief outage.
Why wrong: RDS does not modify both simultaneously; it uses a rolling approach.
- C
The update will fail because CloudFormation cannot modify a Multi-AZ DB instance class.
Why wrong: CloudFormation supports modification of DB instance class for Multi-AZ RDS instances.
- D
RDS will modify the standby instance first, then fail over to it, and finally modify the original primary, resulting in minimal downtime.
This is the standard behavior for Multi-AZ RDS instance class modifications.
Question 548 of 1,546
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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 SysOps administrator is automating the creation of Amazon RDS DB instances using AWS CloudFormation. The template includes a DB instance with a Multi-AZ deployment. During a stack update, the administrator changes the DB instance class from db.t3.small to db.t3.medium. What is the expected behavior during the update?
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
✓
RDS will modify the standby instance first, then fail over to it, and finally modify the original primary, resulting in minimal downtime.
When updating a Multi-AZ RDS DB instance class via CloudFormation, AWS performs a 'rolling upgrade' to minimize downtime. RDS first modifies the standby instance to the new class, then initiates a failover to make the standby the new primary, and finally modifies the original primary (now the standby) to the new class. This results in only a brief outage during the failover, typically lasting 60–120 seconds.
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.
- ✗
RDS will create a new DB instance with the new class and delete the old one.
Why it's wrong here
RDS does not create a new instance for a class change; it modifies the existing instance.
- ✗
RDS will modify both instances simultaneously, causing a brief outage.
Why it's wrong here
RDS does not modify both simultaneously; it uses a rolling approach.
- ✗
The update will fail because CloudFormation cannot modify a Multi-AZ DB instance class.
Why it's wrong here
CloudFormation supports modification of DB instance class for Multi-AZ RDS instances.
- ✓
RDS will modify the standby instance first, then fail over to it, and finally modify the original primary, resulting in minimal downtime.
Why this is correct
This is the standard behavior for Multi-AZ RDS instance class modifications.
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 assume any modification to a Multi-AZ instance causes a full replacement or simultaneous outage, but AWS specifically designed the Multi-AZ update process to minimize downtime by modifying the standby first and then failing over.
Detailed technical explanation
How to think about this question
Under the hood, the Multi-AZ deployment uses synchronous replication between the primary and standby in different Availability Zones. During the class modification, CloudFormation triggers an RDS API call (ModifyDBInstance) with the new instance class. RDS then applies the change to the standby first, performs a failover (which briefly interrupts connections), and then updates the original primary. The total downtime is limited to the DNS propagation and failover time, typically under two minutes.
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 SOA-C02 question test?
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: RDS will modify the standby instance first, then fail over to it, and finally modify the original primary, resulting in minimal downtime. — When updating a Multi-AZ RDS DB instance class via CloudFormation, AWS performs a 'rolling upgrade' to minimize downtime. RDS first modifies the standby instance to the new class, then initiates a failover to make the standby the new primary, and finally modifies the original primary (now the standby) to the new class. This results in only a brief outage during the failover, typically lasting 60–120 seconds.
What should I do if I get this SOA-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
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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