DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 uses Amazon RDS for Oracle with a Multi-AZ deployment for a critical OLTP application. During a recent failover test, they noticed that the application experienced a two-minute downtime. The team wants to reduce downtime to under 30 seconds during automatic failovers. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate to Amazon Aurora with Multi-AZ and use the Aurora auto-failover feature
Amazon RDS Multi-AZ failovers typically take 1-2 minutes. To reduce failover times, use Multi-AZ with two readable standbys in RDS for Oracle (if supported) or migrate to Amazon Aurora, which has faster failover (typically under 30 seconds) and also provides read replicas. Option A does not help. Option B reduces failover detection time but not the failover process itself. Option D is about read replicas, not failover.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 to offload reads
Why it's wrong here
Read replicas do not reduce failover time.
✗
Reduce the DNS TTL value to 5 seconds
Why it's wrong here
DNS TTL affects client DNS caching but the failover time is dominated by database recovery, not DNS.
✗
Enable Automatic Failover in the RDS console
Why it's wrong here
Automatic failover is already enabled in Multi-AZ deployments.
✓
Migrate to Amazon Aurora with Multi-AZ and use the Aurora auto-failover feature
Why this is correct
Aurora failover is typically under 30 seconds, and it provides faster recovery than RDS Multi-AZ.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. 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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Migrate to Amazon Aurora with Multi-AZ and use the Aurora auto-failover feature — Amazon RDS Multi-AZ failovers typically take 1-2 minutes. To reduce failover times, use Multi-AZ with two readable standbys in RDS for Oracle (if supported) or migrate to Amazon Aurora, which has faster failover (typically under 30 seconds) and also provides read replicas. Option A does not help. Option B reduces failover detection time but not the failover process itself. Option D is about read replicas, not failover.
What should I do if I get this DBS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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