- 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.
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. A key principle to apply: rDS Multi-AZ provides a synchronous standby replica in a different AZ.. 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, meeting the goal of fast database failover with minimal manual intervention.
Key principle: RDS Multi-AZ provides a synchronous standby replica in a different AZ.
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
RDS Multi-AZ provides a synchronous standby replica in a different AZ.
- ✗
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 confuse a read replica (asynchronous, manual promotion) with Multi-AZ (synchronous, automatic failover), or assume that frequent backups or instance sizing improvements can substitute for a dedicated high-availability standby.
Detailed technical explanation
How to think about this question
Multi-AZ for RDS uses synchronous replication to maintain a standby instance in a different AZ, with a DNS CNAME update that automatically redirects traffic to the standby during failover. The failover typically completes within 60–120 seconds, and the standby is kept in sync with the primary using the same storage engine (e.g., InnoDB for MySQL, but for PostgreSQL it uses PostgreSQL’s streaming replication with synchronous commit). A common real-world scenario is that Multi-AZ does not provide read scaling; the standby is not accessible for reads unless you also configure a read replica.
KKey Concepts to Remember
- RDS Multi-AZ provides a synchronous standby replica in a different AZ.
- Automatic failover to the standby occurs in case of primary instance or AZ failure.
- The DB instance endpoint remains the same after failover.
- Multi-AZ is for high availability and disaster recovery, not read scaling.
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
RDS Multi-AZ provides a synchronous standby replica in a different AZ.
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
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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 — RDS Multi-AZ provides a synchronous standby replica in a different AZ..
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, meeting the goal of fast database failover with minimal manual intervention.
What should I do if I get this SAA-C03 question wrong?
Review rDS Multi-AZ provides a synchronous standby replica in a different AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
RDS Multi-AZ provides a synchronous standby replica in a different AZ.
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Last reviewed: Jun 11, 2026
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