- A
Create a Read Replica in another Availability Zone and promote it on failure.
Why wrong: Read Replicas are for read scaling and require manual promotion, which introduces delay and potential data loss.
- B
Enable Multi-AZ deployment on the DB instance.
Multi-AZ provides automatic synchronous replication and automatic failover to a standby in another AZ with minimal downtime.
- C
Take hourly snapshots and automate restoration in another AZ.
Why wrong: Snapshots provide point-in-time recovery but the restoration process takes time, leading to higher RTO and potential data loss.
- D
Use Amazon RDS Proxy to manage connection failover.
Why wrong: RDS Proxy provides connection pooling and improves application resilience but does not provide database failover capability.
Quick Answer
The answer is to enable Multi-AZ deployment on the DB instance. This configuration automatically provisions and maintains a synchronous standby replica in a different Availability Zone, so if the primary instance fails, Amazon RDS handles automatic failover by flipping the DNS record to the standby with zero manual intervention. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of high availability versus disaster recovery—a common trap is confusing Multi-AZ (synchronous, for HA) with Read Replicas (asynchronous, for scaling). Remember that Multi-AZ is about automatic failover, not read scaling; the standby is passive until needed. For a memory tip, think “Multi-AZ = Mirror in Another AZ” to recall that the standby is a synchronous copy ready to take over instantly.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 runs a production Amazon RDS for MySQL DB instance in a single Availability Zone. The SysOps administrator needs to improve database availability to ensure automatic failover if the primary instance fails. Which configuration should the administrator enable?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 deployment on the DB instance.
Enabling Multi-AZ deployment on the DB instance automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary instance fails, Amazon RDS automatically fails over to the standby, providing high availability without manual intervention. This is the native AWS solution for automatic failover for RDS MySQL.
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 another Availability Zone and promote it on failure.
Why it's wrong here
Read Replicas are for read scaling and require manual promotion, which introduces delay and potential data loss.
- ✓
Enable Multi-AZ deployment on the DB instance.
Why this is correct
Multi-AZ provides automatic synchronous replication and automatic failover to a standby in another AZ with minimal downtime.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Take hourly snapshots and automate restoration in another AZ.
Why it's wrong here
Snapshots provide point-in-time recovery but the restoration process takes time, leading to higher RTO and potential data loss.
- ✗
Use Amazon RDS Proxy to manage connection failover.
Why it's wrong here
RDS Proxy provides connection pooling and improves application resilience but does not provide database failover capability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Read Replicas (asynchronous, for read scaling) with Multi-AZ (synchronous, for high availability), assuming promoting a Read Replica provides the same automatic failover guarantee.
Detailed technical explanation
How to think about this question
Multi-AZ for RDS MySQL uses synchronous replication to the standby instance in a different AZ, ensuring zero data loss during failover (within the scope of committed transactions). The failover is triggered by a DNS CNAME change, which typically completes within 60-120 seconds, and the standby is promoted to primary automatically. This is distinct from asynchronous replication used by Read Replicas, which can have replication lag and potential data loss.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Reliability and Business Continuity — study guide chapter
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Reliability and Business Continuity practice questions
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Multi-AZ deployment on the DB instance. — Enabling Multi-AZ deployment on the DB instance automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary instance fails, Amazon RDS automatically fails over to the standby, providing high availability without manual intervention. This is the native AWS solution for automatic failover for RDS MySQL.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on SOA-C02
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 has a production Amazon RDS for MySQL DB instance in a single Availability Zone. The SysOps administrator needs to improve database availability to ensure automatic failover in the event of a database failure or an Availability Zone outage. Which configuration should the administrator enable?
medium- ✓ A.Enable Multi-AZ deployment
- B.Create a read replica in another Availability Zone
- C.Enable automated backups
- D.Change the DB instance to a larger instance class
Why A: Enabling a Multi-AZ deployment for Amazon RDS for MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a database failure or an AZ outage, Amazon RDS automatically fails over to the standby replica, typically within 60–120 seconds, without requiring manual intervention. This configuration meets the requirement for automatic failover and improved availability.
Last reviewed: Jun 11, 2026
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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