- A
Wait for AWS to automatically fail over the read replica to become the new primary
Why wrong: RDS cross-region read replicas do not automatically failover. Manual promotion is required. Only Multi-AZ provides automatic same-region failover.
- B
Restore the primary database from the most recent automated snapshot in us-west-2
Why wrong: The read replica is more current than a daily snapshot and is faster to promote. Snapshot restoration is the last resort when no replica exists.
- C
Manually promote the us-west-2 read replica to a standalone DB instance and update application endpoints
Manual promotion is the correct procedure. The replica becomes a writable standalone DB in us-west-2. Applications must update their connection strings to the new endpoint.
- D
Create a new RDS instance in us-west-2 and manually restore data from application logs
Why wrong: Manually restoring data from application logs is not a valid DR procedure. Use the read replica which already contains synchronized production data.
Quick Answer
The answer is to manually promote the us-west-2 read replica to a standalone DB instance and update the application endpoints. This is correct because cross-region RDS read replicas are designed for disaster recovery but do not support automatic failover; promotion is a manual action that breaks the replication link and converts the replica into an independent, writable database instance. On the SAA-C03 exam, this scenario tests your understanding of the critical difference between RDS Multi-AZ (which provides automatic failover within a region) and cross-region read replicas (which require manual intervention for disaster recovery). A common trap is assuming that read replicas fail over automatically like Multi-AZ, but they do not—you must manually promote and then redirect traffic. Remember: if it crosses regions, you must manually promote; if it stays in one region, Multi-AZ handles it. Memory tip: “Cross-region means cross your fingers and click promote.”
SAA-C03 Practice Question: Cross-region RDS read replica failover requires…
This SAA-C03 practice question tests your understanding of design resilient architectures. 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 RDS read replica failover requires manual promotion — it is not automatic. 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 runs a production MySQL database on Amazon RDS in us-east-1. A read replica exists in us-west-2 for disaster recovery. The primary region experiences a complete outage. Which of the following describes the correct procedure to restore database service using the cross-region read replica?
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
Manually promote the us-west-2 read replica to a standalone DB instance and update application endpoints
Cross-region RDS read replicas support manual promotion to a standalone database instance. When the primary region fails, the replica must be manually promoted — this makes it an independent writable instance in us-west-2. Key points: Promotion is NOT automatic (unlike RDS Multi-AZ failover). Promotion breaks the replication link — the replica becomes autonomous. After promotion, application connection strings must be updated to the new endpoint. Any replication lag at the time of the outage represents potential data loss (RPO > 0).
Key principle: Cross-region RDS read replica failover requires manual promotion — it is not automatic
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Wait for AWS to automatically fail over the read replica to become the new primary
Why it's wrong here
RDS cross-region read replicas do not automatically failover. Manual promotion is required. Only Multi-AZ provides automatic same-region failover.
- ✗
Restore the primary database from the most recent automated snapshot in us-west-2
Why it's wrong here
The read replica is more current than a daily snapshot and is faster to promote. Snapshot restoration is the last resort when no replica exists.
- ✓
Manually promote the us-west-2 read replica to a standalone DB instance and update application endpoints
Why this is correct
Manual promotion is the correct procedure. The replica becomes a writable standalone DB in us-west-2. Applications must update their connection strings to the new endpoint.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Cross-region RDS read replica failover requires manual promotion — it is not automatic
- ✗
Create a new RDS instance in us-west-2 and manually restore data from application logs
Why it's wrong here
Manually restoring data from application logs is not a valid DR procedure. Use the read replica which already contains synchronized production data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
RDS Multi-AZ provides automatic failover — no manual action required. Cross-region read replicas do NOT failover automatically — promotion must be manually triggered. This distinction appears frequently. For automatic cross-region failover with near-zero RPO, use Amazon Aurora Global Database.
Detailed technical explanation
How to think about this question
RDS DR options comparison: - Multi-AZ (same region): ~60-120s RTO, near-zero RPO, automatic failover - Cross-region read replica: minutes RTO (manual promotion), seconds-minutes RPO (lag), manual - Aurora Global Database: ~1 minute RTO, <1 second RPO, managed failover - Snapshot restore: hours RTO, since last snapshot RPO, manual Read replica promotion steps: 1. Open RDS console or use CLI: promote-read-replica 2. Select the replica in us-west-2 3. Choose Promote read replica 4. Wait for promotion to complete (brief downtime) 5. Update application DNS/connection strings to new endpoint
KKey Concepts to Remember
- Cross-region RDS read replica failover requires manual promotion — it is not automatic
- Promotion breaks the replication link — the replica becomes an independent writable instance
- Any replication lag at the time of outage becomes the RPO (data may be lost)
- RDS Multi-AZ provides automatic same-region failover; cross-region requires manual action
- Aurora Global Database supports managed cross-region failover with sub-second RPO
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 RDS read replica failover requires manual promotion — it is not automatic
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 RDS read replica failover requires manual promotion — it is not automatic 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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Cross-region RDS read replica failover requires manual promotion — it is not automatic.
What is the correct answer to this question?
The correct answer is: Manually promote the us-west-2 read replica to a standalone DB instance and update application endpoints — Cross-region RDS read replicas support manual promotion to a standalone database instance. When the primary region fails, the replica must be manually promoted — this makes it an independent writable instance in us-west-2. Key points: Promotion is NOT automatic (unlike RDS Multi-AZ failover). Promotion breaks the replication link — the replica becomes autonomous. After promotion, application connection strings must be updated to the new endpoint. Any replication lag at the time of the outage represents potential data loss (RPO > 0).
What should I do if I get this SAA-C03 question wrong?
Review cross-region RDS read replica failover requires manual promotion — it is not automatic, then practise related SAA-C03 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 RDS read replica failover requires manual promotion — it is not automatic
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Last reviewed: May 17, 2026
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