- A
Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution.
Monitoring metrics and DNS can pinpoint the cause of increased latency.
- B
Promote the secondary instance to primary manually.
Why wrong: Multi-AZ failover is automatic; manual promotion is not needed.
- C
Create a new read replica and redirect traffic.
Why wrong: A read replica does not resolve the latency issue from DNS caching.
- D
Force a reboot of the DB instance to reset connections.
Why wrong: A reboot does not address DNS caching issues.
Question 1,728 of 1,730
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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 is using Amazon RDS for MySQL with Multi-AZ deployment. The database experiences a failover event, and after failover, the application reports increased latency. Which action should the database specialist take to diagnose the issue?
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
✓
Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution.
After a Multi-AZ failover, the DNS record for the RDS endpoint is updated to point to the new primary in a different Availability Zone. If the application's DNS cache still resolves to the old IP (which is now unreachable or in a different AZ), connections may time out or route suboptimally, increasing latency. Checking CloudWatch metrics for Database Connections and Latency helps isolate whether the issue is due to connection churn, resource contention, or DNS caching, while verifying DNS resolution confirms the application is connecting to the correct endpoint.
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.
- ✓
Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution.
Why this is correct
Monitoring metrics and DNS can pinpoint the cause of increased latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Promote the secondary instance to primary manually.
Why it's wrong here
Multi-AZ failover is automatic; manual promotion is not needed.
- ✗
Create a new read replica and redirect traffic.
Why it's wrong here
A read replica does not resolve the latency issue from DNS caching.
- ✗
Force a reboot of the DB instance to reset connections.
Why it's wrong here
A reboot does not address DNS caching issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume increased latency after failover is always due to resource exhaustion or a need to reset connections, overlooking the common root cause of DNS caching and stale client connections routing to the wrong AZ.
Detailed technical explanation
How to think about this question
During a Multi-AZ failover, the standby instance is promoted to primary, but its buffer pool is initially cold, leading to increased read latency until the working set is cached. Additionally, the DNS TTL for the RDS endpoint is typically set to 30 seconds, but client-side DNS caching may exceed this, causing connections to the old IP to fail or be redirected across AZs, increasing network latency. CloudWatch's 'Database Connections' metric can reveal a spike in new connections as clients reconnect, while 'Read Latency' and 'Write Latency' metrics help differentiate between a cold buffer pool and network-induced delays.
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.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check Amazon CloudWatch metrics for Database Connections and Latency, and verify DNS resolution. — After a Multi-AZ failover, the DNS record for the RDS endpoint is updated to point to the new primary in a different Availability Zone. If the application's DNS cache still resolves to the old IP (which is now unreachable or in a different AZ), connections may time out or route suboptimally, increasing latency. Checking CloudWatch metrics for Database Connections and Latency helps isolate whether the issue is due to connection churn, resource contention, or DNS caching, while verifying DNS resolution confirms the application is connecting to the correct endpoint.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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