- A
Cross-region backup and restore
Why wrong: Backup restore has RPO measured in hours and RTO in hours, not meeting the requirements.
- B
Multi-region configuration with read-write replicas (e.g., nam3)
A multi-region configuration with read-write replicas provides automatic failover with RPO ~15s and RTO < 1min.
- C
Point-in-time recovery (PITR)
Why wrong: PITR is for recovering to a specific point in time, not for automatic failover.
- D
Regional instance
A regional instance provides RPO=0 and automatic failover within the region (RTO seconds), meeting RPO<30s and RTO<1min.
- E
Multi-region configuration with read-only replicas
Why wrong: Read-only replicas do not provide automatic failover; they are for reads only.
Question 888 of 1,000
PCDOE Cloud Spanner regional instance Practice Question
This PCDOE practice question tests your understanding of design for reliability, scalability, and disaster recovery. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cloud Spanner regional instance. 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 strategy for their Cloud Spanner database. They need an RPO of less than 30 seconds and an RTO of less than 1 minute. Which two configurations would meet these requirements? (Choose TWO)
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
✓
Multi-region configuration with read-write replicas (e.g., nam3)
The correct answers are B and D. A multi-region configuration with read-write replicas (e.g., nam3) provides automatic failover across regions with an RPO of approximately 15 seconds and an RTO of less than 1 minute, meeting the requirements for region-level failures. A regional instance in Cloud Spanner provides synchronous replication within the region, achieving an RPO of zero and an RTO of seconds, which meets the requirements for zone-level failures within a region. Option A (cross-region backup and restore) typically has an RPO of hours and RTO of hours, so it does not meet the strict RPO/RTO. Option C (point-in-time recovery) provides RPO of seconds to minutes but depends on backups and may not achieve RTO <1 minute for restore operations. Option E (multi-region with read-only replicas) does not support automatic failover because read-only replicas cannot become the new leader, so failover is not automatic and RTO would be longer.
Key principle: Cloud Spanner regional instance
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cross-region backup and restore
Why it's wrong here
Backup restore has RPO measured in hours and RTO in hours, not meeting the requirements.
- ✓
Multi-region configuration with read-write replicas (e.g., nam3)
Why this is correct
A multi-region configuration with read-write replicas provides automatic failover with RPO ~15s and RTO < 1min.
Related concept
Cloud Spanner regional instance
- ✗
Point-in-time recovery (PITR)
Why it's wrong here
PITR is for recovering to a specific point in time, not for automatic failover.
- ✓
Regional instance
Why this is correct
A regional instance provides RPO=0 and automatic failover within the region (RTO seconds), meeting RPO<30s and RTO<1min.
Related concept
Cloud Spanner regional instance
- ✗
Multi-region configuration with read-only replicas
Why it's wrong here
Read-only replicas do not provide automatic failover; they are for reads only.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Cloud Spanner regional instance
- Cloud Spanner multi-region configuration
- RPO and RTO
- Read-only replicas limitation
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
Cloud Spanner regional instance
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. Cloud Spanner regional instance 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
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FAQ
Questions learners often ask
What does this PCDOE question test?
Design for Reliability, Scalability, and Disaster Recovery — This question tests Design for Reliability, Scalability, and Disaster Recovery — Cloud Spanner regional instance.
What is the correct answer to this question?
The correct answer is: Multi-region configuration with read-write replicas (e.g., nam3) — The correct answers are B and D. A multi-region configuration with read-write replicas (e.g., nam3) provides automatic failover across regions with an RPO of approximately 15 seconds and an RTO of less than 1 minute, meeting the requirements for region-level failures. A regional instance in Cloud Spanner provides synchronous replication within the region, achieving an RPO of zero and an RTO of seconds, which meets the requirements for zone-level failures within a region. Option A (cross-region backup and restore) typically has an RPO of hours and RTO of hours, so it does not meet the strict RPO/RTO. Option C (point-in-time recovery) provides RPO of seconds to minutes but depends on backups and may not achieve RTO <1 minute for restore operations. Option E (multi-region with read-only replicas) does not support automatic failover because read-only replicas cannot become the new leader, so failover is not automatic and RTO would be longer.
What should I do if I get this PCDOE question wrong?
Review cloud Spanner regional instance, then practise related PCDOE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Cloud Spanner regional instance
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Last reviewed: Jul 4, 2026
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