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 is running a critical application on Amazon RDS for Oracle. They need to ensure high availability with automatic failover in case of a database failure. The database size is 500 GB. Which solution should they implement?
Create a cross-Region read replica
Why wrong: Read replicas do not provide automatic failover.
Migrate to Amazon DynamoDB Global Tables
Why wrong: This is a different database service and would require application changes.
Take regular snapshots and restore in a different Availability Zone
Why wrong: Snapshot restore is manual and not automatic.
Enable Multi-AZ deployment
Multi-AZ automatically fails over to a standby instance.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable Multi-AZ deployment
Multi-AZ for RDS Oracle provides automatic failover to a standby in a different Availability Zone. Option B (read replicas) are for read scaling, not automatic failover. Option C (manual snapshot restore) is not automatic. Option D (DynamoDB) is a different database service.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Create a cross-Region read replica
Why it's wrong here
Read replicas do not provide automatic failover.
Migrate to Amazon DynamoDB Global Tables
Why it's wrong here
This is a different database service and would require application changes.
Take regular snapshots and restore in a different Availability Zone
Why it's wrong here
Snapshot restore is manual and not automatic.
Enable Multi-AZ deployment
Why this is correct
Multi-AZ automatically fails over to a standby instance.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
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.
What to study next
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.
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FAQ
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Standard ACLs match source addresses..
The correct answer is: Enable Multi-AZ deployment — Multi-AZ for RDS Oracle provides automatic failover to a standby in a different Availability Zone. Option B (read replicas) are for read scaling, not automatic failover. Option C (manual snapshot restore) is not automatic. Option D (DynamoDB) is a different database service.
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.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
This DBS-C01 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 DBS-C01 exam.
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