The answer is to create a read replica, upgrade it, and then promote it to the primary. This strategy minimizes downtime because the read replica can be upgraded independently while the original primary instance continues serving the SAP workload, and the cutover is a fast promotion operation that avoids a lengthy database shutdown. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of high-availability patterns for RDS Oracle upgrades, specifically how to leverage read replicas to achieve near-zero downtime for critical SAP systems. A common trap is selecting the modify DB instance option, which forces an immediate upgrade with significant downtime, or assuming a snapshot restore is faster. Remember the memory tip: “Replica, Upgrade, Promote” – like a relay race, you hand off the baton without stopping the runner.
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 system uses a large Amazon RDS for Oracle instance. The operations team wants to minimize downtime during a major version upgrade. Which strategy should they use?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a read replica, upgrade it, and then promote it to the primary
Option B is correct because using a read replica allows you to upgrade the replica and then promote it, minimizing downtime. Option A (taking a snapshot and restoring) has downtime. Option C (modifying the DB instance) causes downtime. Option D (using AWS DMS) requires complex setup and may introduce latency.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 database and restore it as a new instance with the upgraded version
Why it's wrong here
Restoring from snapshot requires downtime.
✓
Create a read replica, upgrade it, and then promote it to the primary
Why this is correct
Minimizes downtime by failing over to the upgraded replica.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Modify the DB instance and apply the upgrade immediately
Why it's wrong here
An immediate upgrade causes downtime during the modification.
✗
Use AWS Database Migration Service (DMS) to migrate to a new instance
Why it's wrong here
DMS can be used but involves more complexity and potential latency.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. 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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
Operations and Maintenance — This question tests Operations and Maintenance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a read replica, upgrade it, and then promote it to the primary — Option B is correct because using a read replica allows you to upgrade the replica and then promote it, minimizing downtime. Option A (taking a snapshot and restoring) has downtime. Option C (modifying the DB instance) causes downtime. Option D (using AWS DMS) requires complex setup and may introduce latency.
What should I do if I get this PAS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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Question Discussion
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