The correct answer is to modify the RDS instance to increase the allocated storage, as this allows for a storage increase on a Multi-AZ deployment with minimal downtime. When you modify the allocated storage for a Multi-AZ RDS instance, the change can be applied immediately or during the next maintenance window, and the process involves a brief failover to the standby instance, which typically completes within a minute or two, ensuring high availability is preserved. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how Multi-AZ configurations handle storage modifications differently from single-AZ instances, where a storage increase can cause a longer outage. A common trap is assuming you must create a read replica or take a snapshot to resize storage, but those approaches introduce unnecessary complexity or fail to address the primary instance’s capacity. Remember the memory tip: “Multi-AZ mods mean a quick failover, not a full stopover.”
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 RDS for MySQL database. The SysOps administrator receives an alert that the database instance is running out of storage. The company requires high availability and minimal downtime during any modifications. What should the administrator do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the RDS instance to increase the allocated storage. Since the instance is Multi-AZ, the modification will be applied with minimal downtime.
Modifying the allocated storage for a Multi-AZ RDS instance can be done with minimal downtime; the modification is applied during the next maintenance window or immediately with a brief failover. Option A is wrong because it does not address the storage issue permanently. Option C is wrong because it requires more effort and potential downtime. Option D is wrong because read replicas do not increase storage capacity of the primary.
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.
✗
Add a read replica and use it for read traffic to reduce load on the primary.
Why it's wrong here
Read replicas do not increase storage capacity.
✓
Modify the RDS instance to increase the allocated storage. Since the instance is Multi-AZ, the modification will be applied with minimal downtime.
Why this is correct
RDS allows storage scaling with minimal downtime, especially for Multi-AZ instances.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a CloudWatch alarm to notify when storage is low, then manually clean up old data.
Why it's wrong here
Cleaning data is a temporary fix and may not be feasible.
✗
Create a new RDS instance with larger storage and migrate the data using AWS Database Migration Service.
Why it's wrong here
This is more complex and introduces longer downtime than a simple storage modification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
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.
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Modify the RDS instance to increase the allocated storage. Since the instance is Multi-AZ, the modification will be applied with minimal downtime. — Modifying the allocated storage for a Multi-AZ RDS instance can be done with minimal downtime; the modification is applied during the next maintenance window or immediately with a brief failover. Option A is wrong because it does not address the storage issue permanently. Option C is wrong because it requires more effort and potential downtime. Option D is wrong because read replicas do not increase storage capacity of the primary.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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