The answer is to create an Amazon RDS Proxy and configure the application to connect to the proxy endpoint. RDS Proxy minimizes Aurora failover downtime by pooling and reusing database connections, so when a primary instance fails, the proxy transparently redirects those connections to the new writer without dropping them. This eliminates the need for application-level retry logic, reducing what was a 10-minute outage to just seconds and meeting the 99.99% SLA requirement. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how RDS Proxy decouples the application from database failover events—a common trap is assuming Multi-AZ alone solves the problem, but without a proxy, the application still faces a connection break. Remember the key insight: RDS Proxy is the only solution that handles failover without code changes because it maintains the session state. A useful memory tip is “Proxy prevents panic”—it shields the app from the failover storm.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 critical e-commerce application on Amazon Aurora MySQL with a single DB instance. The database has 8 TB of data and uses the default writer endpoint. Recently, the application experienced a 10-minute outage during a primary instance failover. The failover was triggered by an underlying hardware issue. The database specialist needs to minimize downtime during future failovers. The application team is unwilling to modify the application code to handle connection retries. The company has a 99.99% SLA requirement. Which solution should the database specialist implement to meet the SLA with minimal application changes?
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.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an Amazon RDS Proxy and configure the application to connect to the proxy endpoint
Amazon RDS Proxy sits between the application and the database, pooling and reusing database connections. During a failover, RDS Proxy maintains the client connections and transparently reconnects to the new primary instance, so the application does not experience a connection loss and does not need to implement retry logic. This directly addresses the 10-minute outage by reducing failover downtime to seconds, meeting the 99.99% SLA without application code changes.
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.
✗
Increase the DB instance class to a larger size to improve performance and reduce failover time
Why it's wrong here
Instance size does not affect failover detection or recovery time.
✗
Enable Multi-AZ deployment with automatic failover
Why it's wrong here
Multi-AZ is already enabled; the issue is that the application does not retry connections, so failover still causes downtime.
✓
Create an Amazon RDS Proxy and configure the application to connect to the proxy endpoint
Why this is correct
RDS Proxy handles failover seamlessly by preserving connections and reducing downtime.
Clue confirmation
The clue words "primary", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a cross-Region read replica and promote it to primary during failover
Why it's wrong here
Promoting a read replica requires DNS changes and application reconnection, causing downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Multi-AZ (Option B) is sufficient for zero-downtime failover, but they overlook that the application must handle connection retries, which the question explicitly prohibits, making RDS Proxy the only solution that provides transparent failover without code changes.
Detailed technical explanation
How to think about this question
RDS Proxy uses a connection multiplexing architecture where it maintains a warm pool of connections to the database. On failover, the proxy detects the new writer endpoint via the Aurora DNS and re-establishes its internal connections, while the application-side TCP connections remain open. This reduces failover impact to typically under 1 second, as the proxy absorbs the DNS propagation delay and transaction replay. The proxy also supports IAM authentication and can cache credentials, further reducing latency.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an Amazon RDS Proxy and configure the application to connect to the proxy endpoint — Amazon RDS Proxy sits between the application and the database, pooling and reusing database connections. During a failover, RDS Proxy maintains the client connections and transparently reconnects to the new primary instance, so the application does not experience a connection loss and does not need to implement retry logic. This directly addresses the 10-minute outage by reducing failover downtime to seconds, meeting the 99.99% SLA without application code changes.
What should I do if I get this DBS-C01 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", "minimum / minimize". 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.
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Question Discussion
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