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 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?
Multi-AZ provides a standby instance in another AZ with automatic failover, meeting the high availability requirement.
B
Create a read replica in another Availability Zone
Why wrong: Read replicas are used to offload read traffic; they do not provide automatic failover. Promotion would be a manual process.
C
Enable automated backups
Why wrong: Automated backups enable point-in-time recovery but do not provide automatic failover; recovery requires manual action and has a longer RTO.
D
Change the DB instance to a larger instance class
Why wrong: Larger instance classes improve performance but do not add redundancy or automatic failover capabilities.
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
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.
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 deployment
Why this is correct
Multi-AZ provides a standby instance in another AZ with automatic failover, meeting the high availability requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a read replica in another Availability Zone
Why it's wrong here
Read replicas are used to offload read traffic; they do not provide automatic failover. Promotion would be a manual process.
✗
Enable automated backups
Why it's wrong here
Automated backups enable point-in-time recovery but do not provide automatic failover; recovery requires manual action and has a longer RTO.
✗
Change the DB instance to a larger instance class
Why it's wrong here
Larger instance classes improve performance but do not add redundancy or automatic failover capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a read replica with a Multi-AZ standby, mistakenly believing that a read replica can provide automatic failover, but read replicas require manual promotion and do not maintain synchronous replication.
Detailed technical explanation
How to think about this question
In a Multi-AZ deployment, Amazon RDS uses synchronous replication from the primary to the standby instance, ensuring zero data loss during failover. The failover is handled by updating the DNS record for the DB instance endpoint to point to the standby, and the process is transparent to applications using the same endpoint. A subtle behavior is that during a failover, any in-flight transactions are rolled back, and the application must retry them, which is important for designing resilient application logic.
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 — 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 — 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.
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.
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Question Discussion
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