- A
Create a read replica in a different Availability Zone and configure the application to fail over manually.
Why wrong: Read replicas improve read scaling, but manual failover and replication lag can still harm failover objectives.
- B
Enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover.
RDS Multi-AZ maintains a standby in another AZ and supports automatic failover, improving resilience and reducing manual work.
- C
Switch the database to use EBS snapshots more frequently and restore in case of failure.
Why wrong: Snapshot restore is a backup/recovery approach and typically does not meet fast failover requirements.
- D
Pin the DB to a specific instance type with higher CPU credits to prevent CPU-related disconnects.
Why wrong: Instance sizing affects performance but not AZ-level failover behavior or redundancy.
Quick Answer
The answer is to enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover. This is correct because Multi-AZ creates a synchronous standby replica in a different Availability Zone, ensuring that if the primary instance fails, AWS automatically flips the DNS record to the standby with zero manual intervention and typically under a minute of downtime. On the SAA-C03 exam, this scenario tests your understanding of high-availability architecture versus scaling; a common trap is confusing Multi-AZ (for failover) with Read Replicas (for read scaling). Remember that Multi-AZ provides automatic failover but does not improve read performance or serve as a backup—it is purely for availability. A useful memory tip: think “Multi-AZ = Mirror, Read Replica = Read.”
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. 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 company uses Amazon RDS for a PostgreSQL database powering a customer-facing application. The application’s availability depends on fast database failover with minimal manual intervention. The RDS instance currently runs as a single-AZ deployment in one DB subnet group. Which change most directly meets the goal?
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
Enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover.
Enabling Multi-AZ for the RDS DB instance creates a synchronous standby replica in a different Availability Zone. AWS automatically handles failover to the standby with no manual intervention required, which directly meets the goal of fast database failover with minimal manual intervention.
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.
- ✗
Create a read replica in a different Availability Zone and configure the application to fail over manually.
Why it's wrong here
Read replicas improve read scaling, but manual failover and replication lag can still harm failover objectives.
- ✓
Enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover.
Why this is correct
RDS Multi-AZ maintains a standby in another AZ and supports automatic failover, improving resilience and reducing manual work.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Switch the database to use EBS snapshots more frequently and restore in case of failure.
Why it's wrong here
Snapshot restore is a backup/recovery approach and typically does not meet fast failover requirements.
- ✗
Pin the DB to a specific instance type with higher CPU credits to prevent CPU-related disconnects.
Why it's wrong here
Instance sizing affects performance but not AZ-level failover behavior or redundancy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas (which are for read scaling and manual promotion) with Multi-AZ (which provides automatic failover and high availability), leading them to choose Option A incorrectly.
Detailed technical explanation
How to think about this question
Multi-AZ RDS uses synchronous replication to maintain a standby instance in a different AZ, ensuring zero data loss during failover. The failover is triggered automatically by DNS record updates (CNAME change) and typically completes within 60–120 seconds. In a real-world scenario, this is critical for production workloads where even a few minutes of downtime can result in significant revenue loss or SLA breaches.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover. — Enabling Multi-AZ for the RDS DB instance creates a synchronous standby replica in a different Availability Zone. AWS automatically handles failover to the standby with no manual intervention required, which directly meets the goal of fast database failover with minimal manual intervention.
What should I do if I get this SAA-C03 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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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses Amazon RDS for a PostgreSQL database powering a customer-facing application. The application’s availability depends on fast database failover with minimal manual intervention. The RDS instance currently runs as a single-AZ deployment in one DB subnet group. Which change most directly meets the goal?
medium- A.Create a read replica in a different Availability Zone and configure the application to fail over manually.
- ✓ B.Enable Multi-AZ for the RDS DB instance so AWS manages a standby in another Availability Zone with automatic failover.
- C.Switch the database to use EBS snapshots more frequently and restore in case of failure.
- D.Pin the DB to a specific instance type with higher CPU credits to prevent CPU-related disconnects.
Why B: Enabling Multi-AZ for the RDS DB instance creates a synchronous standby replica in a different Availability Zone. AWS automatically handles failover to the standby with no manual intervention required, meeting the goal of fast database failover with minimal manual intervention.
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Last reviewed: Jun 11, 2026
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