- A
Enable Multi-AZ on the RDS instance.
Multi-AZ provides automatic failover to a standby in another AZ.
- B
Take a manual snapshot every hour.
Why wrong: Manual snapshots are not automated for failover and have higher RPO.
- C
Create a read replica in a different Region.
Why wrong: Read replicas are for read scaling, not automatic failover.
- D
Configure automated backups with a retention period of 30 days.
Automated backups allow point-in-time recovery within the retention window.
- E
Increase the DB instance class to the largest available.
Why wrong: Larger instance class improves performance but not reliability.
Question 1,057 of 1,546
RDS Database Reliability — Multi-AZ and Automated Backups | AWS SysOps Associate Explained
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 web application on EC2 instances in an Auto Scaling group behind an ALB. The application uses an RDS MySQL database. The SysOps administrator needs to improve the reliability of the database layer. Which TWO actions should the administrator take? (Choose two.)
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 on the RDS instance.
Enabling Multi-AZ on an RDS MySQL 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 and improving database reliability without manual intervention. This directly addresses the need for a resilient database layer.
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.
- ✓
Enable Multi-AZ on the RDS instance.
Why this is correct
Multi-AZ provides automatic failover to a standby in another AZ.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Take a manual snapshot every hour.
Why it's wrong here
Manual snapshots are not automated for failover and have higher RPO.
- ✗
Create a read replica in a different Region.
Why it's wrong here
Read replicas are for read scaling, not automatic failover.
- ✓
Configure automated backups with a retention period of 30 days.
Why this is correct
Automated backups allow point-in-time recovery within the retention window.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the DB instance class to the largest available.
Why it's wrong here
Larger instance class improves performance but not reliability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing backup strategies (automated backups, manual snapshots) or read replicas with high-availability features like Multi-AZ, leading candidates to select options that improve data durability or read performance instead of database layer reliability.
Detailed technical explanation
How to think about this question
Multi-AZ RDS uses synchronous replication to a standby instance in a different Availability Zone, with automatic failover typically completing 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 and can be promoted to a standalone instance, but this requires manual intervention and may result in data loss if replication lag exists.
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
Learn the concepts, then practise the 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 on the RDS instance. — Enabling Multi-AZ on an RDS MySQL 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 and improving database reliability without manual intervention. This directly addresses the need for a resilient database layer.
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.
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 →
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Last reviewed: Jul 4, 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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