SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: multi-AZ provides synchronous replication to a standby 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 payments API uses an RDS MySQL database and must remain available during an Availability Zone failure with minimal application changes. What should the architect enable? The design must avoid adding custom operational scripts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Multi-AZ deployment for the RDS DB instance
Multi-AZ deployment for RDS MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary AZ fails, RDS performs an automatic failover to the standby, ensuring database availability with minimal application changes (the application only needs to reconnect using the same endpoint). This meets the requirement of avoiding custom operational scripts.
Key principle: Multi-AZ provides synchronous replication to a standby 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.
✗
S3 Cross-Region Replication
Why it's wrong here
S3 CRR applies to S3 objects, not RDS failover.
✓
Multi-AZ deployment for the RDS DB instance
Why this is correct
Multi-AZ provides synchronous standby replication and automatic failover within a Region.
Related concept
Multi-AZ provides synchronous replication to a standby in a different AZ.
✗
Read replicas only
Why it's wrong here
Read replicas improve read scalability and can support DR, but they are not the primary automatic AZ failover feature.
✗
EBS snapshots every hour
Why it's wrong here
Snapshots help recovery but do not provide automatic high availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas with Multi-AZ, thinking read replicas provide high availability, but they lack automatic failover for write traffic and require manual promotion, which violates the 'no custom operational scripts' constraint.
Detailed technical explanation
How to think about this question
In a Multi-AZ deployment, RDS uses synchronous replication to the standby instance in a different AZ, ensuring zero data loss during failover (committed transactions are preserved). The failover is triggered automatically by DNS changes, typically completing within 60–120 seconds, and the application endpoint remains unchanged. This architecture also provides automatic patching and maintenance with minimal downtime by failing over to the standby during updates.
KKey Concepts to Remember
Multi-AZ provides synchronous replication to a standby in a different AZ.
Automatic failover occurs to the standby in case of primary instance failure.
The DB endpoint remains the same after a Multi-AZ failover.
Multi-AZ is designed for high availability and disaster recovery within a Region.
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
Multi-AZ provides synchronous replication to a standby in a different AZ.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review multi-AZ provides synchronous replication to a standby in a different AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Resilient Architectures — This question tests Design Resilient Architectures — Multi-AZ provides synchronous replication to a standby in a different AZ..
What is the correct answer to this question?
The correct answer is: Multi-AZ deployment for the RDS DB instance — Multi-AZ deployment for RDS MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary AZ fails, RDS performs an automatic failover to the standby, ensuring database availability with minimal application changes (the application only needs to reconnect using the same endpoint). This meets the requirement of avoiding custom operational scripts.
What should I do if I get this SAA-C03 question wrong?
Review multi-AZ provides synchronous replication to a standby 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?
Multi-AZ provides synchronous replication to a standby in a different AZ.
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Question Discussion
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