The answer is the UpdatePolicy attribute with AutoScalingRollingUpdate and MinInstancesInService set to 1. This is correct because MinInstancesInService directly controls the minimum number of instances that must remain in service during a rolling update, ensuring that at least one instance stays available to handle traffic while others are being updated. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this concept tests your understanding of how to maintain high availability for SAP application servers during infrastructure changes, often appearing in CloudFormation template analysis questions where common traps include confusing MinInstancesInService with DesiredCapacity or MaxSize. A reliable memory tip is to think of MinInstancesInService as your "safety net" during updates—it guarantees a floor of running instances, unlike DesiredCapacity which only sets a target, not an update behavior.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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.
An SAP administrator is reviewing a CloudFormation template that defines an Auto Scaling group for SAP application servers. The exhibit shows the relevant section. The group currently has 2 instances running. The administrator wants to ensure that during a rolling update, at least one instance remains available. Which property should be added?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
UpdatePolicy attribute with AutoScalingRollingUpdate and MinInstancesInService set to 1.
Option A is correct because UpdatePolicy with AutoScalingRollingUpdate allows control of the rolling update, including MinInstancesInService to keep at least one instance running. Option B is wrong because DesiredCapacity only sets the target count. Option C is wrong because HealthCheckGracePeriod is for health checks. Option D is wrong because MaxSize does not control rolling updates.
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.
✓
UpdatePolicy attribute with AutoScalingRollingUpdate and MinInstancesInService set to 1.
Why this is correct
This ensures that during updates, at least one instance remains in service.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Set MaxSize to 1.
Why it's wrong here
MaxSize=1 would prevent scaling but not ensure availability during updates.
✗
Set DesiredCapacity to 3.
Why it's wrong here
Increasing capacity does not guarantee availability during updates.
✗
Add a HealthCheckGracePeriod of 300 seconds.
Why it's wrong here
HealthCheckGracePeriod delays health checks but does not ensure availability during updates.
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 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.
Identify which PAS-C01 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.
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: UpdatePolicy attribute with AutoScalingRollingUpdate and MinInstancesInService set to 1. — Option A is correct because UpdatePolicy with AutoScalingRollingUpdate allows control of the rolling update, including MinInstancesInService to keep at least one instance running. Option B is wrong because DesiredCapacity only sets the target count. Option C is wrong because HealthCheckGracePeriod is for health checks. Option D is wrong because MaxSize does not control rolling updates.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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