The answer is configuring the application to use a low TTL for DNS lookups and implementing connection retries. This is correct because while Amazon RDS Multi-AZ failover itself typically completes within one to two minutes, the three-minute timeout observed was likely caused by the application caching the old DNS resolution of the CNAME endpoint; by setting a low DNS TTL—such as five seconds—on the application side, you force the client to re-resolve the endpoint quickly after the failover, pointing it to the new primary IP address and drastically reducing perceived downtime. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that failover time is often a client-side issue, not a database-side one, and a common trap is to assume larger instances or Provisioned IOPS will speed up the failover process itself. Remember the memory tip: “Failover is fast, but DNS caches last—lower the TTL to make the retry pass.”
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is deploying a new Amazon RDS for SQL Server DB instance with Multi-AZ. The database will be used by a critical application that requires minimal downtime during failover. The application uses a single connection string with the CNAME of the RDS endpoint. During a recent failover test, the application experienced a 3-minute timeout. The DBA wants to reduce the failover time. The current RDS instance is db.r5.large with 100 GB gp2 storage. The application is hosted on EC2 in the same VPC. Which change would MOST effectively reduce the failover time?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the application to use a low TTL for DNS lookups and implement connection retries
Option A is correct because Multi-AZ failover typically completes within 1-2 minutes; the 3-minute timeout may be due to DNS caching. Enabling TTL=5 on the application side for DNS lookups can reduce failover time. Option B is wrong because increasing instance size does not directly reduce failover time. Option C is wrong because Provisioned IOPS does not reduce failover time. Option D is wrong because read replicas do not provide automatic failover.
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.
✗
Change the storage to Provisioned IOPS (io1)
Why it's wrong here
Storage type does not affect Multi-AZ failover time.
✗
Change the instance type to db.r5.xlarge
Why it's wrong here
Larger instance size does not reduce failover time.
✓
Configure the application to use a low TTL for DNS lookups and implement connection retries
Why this is correct
Low TTL ensures the DNS record is refreshed quickly, reducing failover time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a read replica with automatic failover
Why it's wrong here
Read replicas are for read scaling, not automatic failover.
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 DBS-C01 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.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the application to use a low TTL for DNS lookups and implement connection retries — Option A is correct because Multi-AZ failover typically completes within 1-2 minutes; the 3-minute timeout may be due to DNS caching. Enabling TTL=5 on the application side for DNS lookups can reduce failover time. Option B is wrong because increasing instance size does not directly reduce failover time. Option C is wrong because Provisioned IOPS does not reduce failover time. Option D is wrong because read replicas do not provide automatic failover.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 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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Question Discussion
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