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Question 956 of 1,040

Design Resilient Architectures →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is to deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled. This configuration is correct because RDS Multi-AZ uses synchronous replication to maintain a standby instance in a different Availability Zone, and when the primary AZ fails, RDS automatically flips the DNS CNAME to the standby, causing only a brief connection interruption with no application code changes required. On the SAA-C03 exam, this scenario tests your understanding of high-availability database architectures within a single region, often contrasting Multi-AZ with Read Replicas or cross-region setups. A common trap is confusing Multi-AZ for read scaling—remember that Multi-AZ is for disaster recovery and automatic failover, not for offloading read traffic. Memory tip: think “Multi-AZ = Mirror, not Multi-read” to keep the purpose clear.

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: rDS Multi-AZ provides synchronous replication to a standby instance.. 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 runs its customer-facing web app on EC2 behind an Application Load Balancer. The database is Amazon RDS for PostgreSQL. The requirement is that if a single Availability Zone fails, the database must automatically fail over within the same AWS Region with minimal application changes. Which database setup best meets this requirement?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1easymultiple choice

Full question →

A
Use an RDS single-AZ instance and periodically restore from automated backups if needed.
Why wrong: Single-AZ deployments do not provide automatic failover for an AZ outage. Restoring from backups requires manual or scripted intervention, increasing downtime.
B
Deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled.
Multi-AZ RDS maintains a standby instance in a different AZ. If the primary fails, RDS performs automatic failover, preserving the same database endpoint behavior.
C
Create a read replica in a different AZ and use it only when the primary fails.
Why wrong: A read replica does not automatically replace a failed primary instance. You would need manual promotion and application rerouting.
D
Use RDS with Multi-AZ disabled, but increase storage IOPS to prevent failover.
Why wrong: Performance changes do not address AZ availability. Storage IOPS does not provide automatic failover capabilities during an Availability Zone outage.

Full breakdown with real-world context →

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

✓

Deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled.

Option B is correct because RDS Multi-AZ with automatic failover provides synchronous replication to a standby instance in a different Availability Zone. If the primary AZ fails, RDS automatically flips the DNS CNAME to the standby, resulting in minimal application changes (only a brief connection interruption). This meets the requirement for automatic failover within the same region without manual intervention.

Key principle: RDS Multi-AZ provides synchronous replication to a standby instance.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Use an RDS single-AZ instance and periodically restore from automated backups if needed.
Why it's wrong here
Single-AZ deployments do not provide automatic failover for an AZ outage. Restoring from backups requires manual or scripted intervention, increasing downtime.
✓
Deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled.
Why this is correct
Multi-AZ RDS maintains a standby instance in a different AZ. If the primary fails, RDS performs automatic failover, preserving the same database endpoint behavior.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
RDS Multi-AZ provides synchronous replication to a standby instance.
✗
Create a read replica in a different AZ and use it only when the primary fails.
Why it's wrong here
A read replica does not automatically replace a failed primary instance. You would need manual promotion and application rerouting.
✗
Use RDS with Multi-AZ disabled, but increase storage IOPS to prevent failover.
Why it's wrong here
Performance changes do not address AZ availability. Storage IOPS does not provide automatic failover capabilities during an Availability Zone outage.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse a read replica (Option C) with a Multi-AZ standby, but a read replica is asynchronous and requires manual promotion, whereas Multi-AZ provides automatic synchronous failover with no application changes beyond reconnecting.

Detailed technical explanation

How to think about this question

RDS Multi-AZ uses synchronous replication at the storage layer (not the database engine) to maintain a standby instance in a different AZ. During a failover, the DNS CNAME is updated to point to the standby, typically within 60–120 seconds. The standby is not accessible for reads or writes until failover occurs, ensuring data consistency. In contrast, read replicas use asynchronous replication, which can lag and result in data loss if promoted during a failure.

KKey Concepts to Remember

RDS Multi-AZ provides synchronous replication to a standby instance.
The standby instance is located in a different Availability Zone.
Automatic failover occurs if the primary instance or its AZ fails.
The database endpoint remains the same after a Multi-AZ failover.

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 synchronous replication to a standby instance.

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 rDS Multi-AZ provides synchronous replication to a standby instance., then practise related SAA-C03 questions on the same topic to reinforce the concept.

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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 synchronous replication to a standby instance..

What is the correct answer to this question?

The correct answer is: Deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled. — Option B is correct because RDS Multi-AZ with automatic failover provides synchronous replication to a standby instance in a different Availability Zone. If the primary AZ fails, RDS automatically flips the DNS CNAME to the standby, resulting in minimal application changes (only a brief connection interruption). This meets the requirement for automatic failover within the same region without manual intervention.

What should I do if I get this SAA-C03 question wrong?

Review rDS Multi-AZ provides synchronous replication to a standby instance., then practise related SAA-C03 questions on the same topic to reinforce the concept.

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

RDS Multi-AZ provides synchronous replication to a standby instance.

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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 runs its customer-facing web app on EC2 behind an Application Load Balancer. The database is Amazon RDS for PostgreSQL. The requirement is that if a single Availability Zone fails, the database must automatically fail over within the same AWS Region with minimal application changes. Which database setup best meets this requirement?

easy

A.Use an RDS single-AZ instance and periodically restore from automated backups if needed.
✓ B.Deploy the RDS PostgreSQL instance as Multi-AZ with automatic failover enabled.
C.Create a read replica in a different AZ and use it only when the primary fails.
D.Use RDS with Multi-AZ disabled, but increase storage IOPS to prevent failover.

Why B: Option B is correct because RDS Multi-AZ for PostgreSQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary AZ fails, Amazon RDS automatically fails over to the standby, typically within 60–120 seconds, with no changes required to the application's connection string (the DNS name remains the same). This meets the requirement for minimal application changes and automatic failover within the same Region.

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