The answer is Multi-AZ deployment with automatic failover and cross-Region read replicas. Multi-AZ synchronously replicates data to a standby instance in a different Availability Zone, enabling automatic failover with zero data loss during infrastructure failures, while cross-Region read replicas asynchronously copy data to a separate AWS Region, allowing manual promotion to a standalone primary for disaster recovery during a full regional outage. On the AWS Certified Database Specialty DBS-C01 exam, this distinction tests your understanding of high availability versus disaster recovery: Multi-AZ handles zonal failures automatically, whereas cross-Region replicas require manual intervention but protect against region-wide loss. A common trap is confusing read replicas for availability—they primarily offload read traffic and enable cross-Region DR, not automatic failover. Memory tip: think “Multi-AZ for automatic zonal survival, cross-Region for manual regional revival.”
DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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.
Which TWO Amazon RDS features can be used to increase the availability of a production database?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cross-Region read replicas with automatic promotion.
Option B is correct because cross-Region read replicas provide a secondary copy of the database in a different AWS Region, which can be manually promoted to a standalone primary instance in the event of a regional outage. This feature increases availability by enabling a disaster recovery strategy that goes beyond a single AWS Region, ensuring business continuity even if the entire primary Region becomes unavailable.
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.
✗
Enhanced Monitoring and Performance Insights.
Why it's wrong here
These are monitoring tools, not availability features.
✓
Cross-Region read replicas with automatic promotion.
Why this is correct
Read replicas can be promoted to primary if the source fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Manual DB snapshot taken every hour.
Why it's wrong here
Snapshots are for backup, not high availability.
✓
Multi-AZ deployment with automatic failover.
Why this is correct
Multi-AZ provides a standby instance for failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
Automated backups with a retention period of 35 days.
Why it's wrong here
Backups help recovery but do not reduce downtime during failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse monitoring features (Enhanced Monitoring, Performance Insights) or backup mechanisms (snapshots, automated backups) with high-availability features, failing to recognize that only Multi-AZ deployments and cross-Region read replicas (with promotion) provide actual failover capabilities to increase availability.
Detailed technical explanation
How to think about this question
Cross-Region read replicas use asynchronous replication (based on MySQL's binlog or PostgreSQL's WAL streaming) to keep the replica up to date with the primary. When promoted, the replica becomes a fully writable standalone instance, but there is no automatic failover—promotion must be initiated manually or via an automated script. This contrasts with Multi-AZ deployments, which use synchronous replication to a standby in a different Availability Zone and provide automatic failover without data loss (in most cases).
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.
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.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cross-Region read replicas with automatic promotion. — Option B is correct because cross-Region read replicas provide a secondary copy of the database in a different AWS Region, which can be manually promoted to a standalone primary instance in the event of a regional outage. This feature increases availability by enabling a disaster recovery strategy that goes beyond a single AWS Region, ensuring business continuity even if the entire primary Region becomes unavailable.
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.
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Question Discussion
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