- A
Create a cross-region read replica in us-west-2.
A cross-region read replica can be promoted to a standalone instance quickly, meeting RTO.
- B
Enable cross-region automated backups to us-west-2.
Cross-region automated backups provide an RPO of up to 5 minutes.
- C
Deploy a Multi-AZ standby in us-east-1.
Why wrong: Multi-AZ is within the same region and does not provide cross-region DR.
- D
Set up cross-region replication using AWS DMS with ongoing replication.
DMS can replicate changes in near real-time, achieving low RPO and RTO.
- E
Take daily manual snapshots and copy them to us-west-2.
Why wrong: Daily snapshots do not meet the RPO of less than 5 minutes.
Question 533 of 1,730
RDS Oracle Cross-Region DR: <5 Minute RPO
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. A key principle to apply: cross-Region Read Replica. 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 designing a disaster recovery plan for an Amazon RDS for Oracle DB instance. The primary region is us-east-1, and the DR region is us-west-2. The RPO must be less than 5 minutes, and the RTO must be less than 15 minutes. Which THREE actions should be taken? (Choose THREE.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
✓
Create a cross-region read replica in us-west-2.
Option A is correct because Amazon RDS for Oracle supports cross-region read replicas, which use asynchronous replication to keep the replica in us-west-2 within seconds of the primary. This can achieve an RPO of less than 5 minutes and, with manual promotion, an RTO of less than 15 minutes. Option B is correct because enabling cross-region automated backups copies backups to us-west-2, providing a baseline backup with a longer retention period. While automated backups alone cannot achieve a 5-minute RPO, they are a critical part of a comprehensive DR strategy, offering protection against data corruption and enabling point-in-time recovery. Option D is correct because AWS DMS with ongoing replication (change data capture) can replicate transactions from the source Oracle DB to a target in us-west-2 with sub-second latency, achieving the required RPO and RTO when combined with a pre-provisioned target.
Key principle: Cross-Region Read Replica
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a cross-region read replica in us-west-2.
Why this is correct
A cross-region read replica can be promoted to a standalone instance quickly, meeting RTO.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Cross-Region Read Replica
- ✓
Enable cross-region automated backups to us-west-2.
Why this is correct
Cross-region automated backups provide an RPO of up to 5 minutes.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Cross-Region Read Replica
- ✗
Deploy a Multi-AZ standby in us-east-1.
Why it's wrong here
Multi-AZ is within the same region and does not provide cross-region DR.
- ✓
Set up cross-region replication using AWS DMS with ongoing replication.
Why this is correct
DMS can replicate changes in near real-time, achieving low RPO and RTO.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Cross-Region Read Replica
- ✗
Take daily manual snapshots and copy them to us-west-2.
Why it's wrong here
Daily snapshots do not meet the RPO of less than 5 minutes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Multi-AZ (high availability within a region) with cross-region disaster recovery, or they assume daily snapshots can meet a 5-minute RPO, failing to recognize that only continuous replication methods (read replicas or DMS CDC) can achieve such a low RPO.
Detailed technical explanation
How to think about this question
Cross-region read replicas for RDS Oracle use Oracle's native async replication (based on redo log shipping) and can be promoted to a standalone instance in minutes, but note that the replica must be in the same DB engine version and the promotion process involves a brief outage. AWS DMS ongoing replication uses Oracle LogMiner or binary reader to capture changes, which can introduce overhead on the source database; it is critical to size the source instance adequately to avoid replication lag. Cross-region automated backups are stored as snapshots in the DR region, but restoring from a snapshot typically takes longer than 15 minutes for large databases, so they are best used as a fallback rather than the primary DR mechanism.
KKey Concepts to Remember
- Cross-Region Read Replica
- Cross-Region Automated Backups
- AWS DMS Ongoing Replication
- Disaster Recovery RPO and RTO
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
Cross-Region Read Replica
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. Cross-Region Read Replica Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review cross-Region Read Replica, then practise related DBS-C01 questions on the same topic to reinforce the concept.
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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 — Cross-Region Read Replica.
What is the correct answer to this question?
The correct answer is: Create a cross-region read replica in us-west-2. — Option A is correct because Amazon RDS for Oracle supports cross-region read replicas, which use asynchronous replication to keep the replica in us-west-2 within seconds of the primary. This can achieve an RPO of less than 5 minutes and, with manual promotion, an RTO of less than 15 minutes. Option B is correct because enabling cross-region automated backups copies backups to us-west-2, providing a baseline backup with a longer retention period. While automated backups alone cannot achieve a 5-minute RPO, they are a critical part of a comprehensive DR strategy, offering protection against data corruption and enabling point-in-time recovery. Option D is correct because AWS DMS with ongoing replication (change data capture) can replicate transactions from the source Oracle DB to a target in us-west-2 with sub-second latency, achieving the required RPO and RTO when combined with a pre-provisioned target.
What should I do if I get this DBS-C01 question wrong?
Review cross-Region Read Replica, then practise related DBS-C01 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Cross-Region Read Replica
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Last reviewed: Jul 4, 2026
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