Deploy scalable and highly available databases in Google Cloud →mediumMultiple ChoiceObjective-mapped
PCDE Practice Question: Deploy scalable and highly available databases in Google Cloud
An organization needs a multi-region database deployment with strong consistency and an RPO of zero in normal operation. They expect a regional outage and require automatic failover within seconds. Which database service and configuration meets these requirements?
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
✓
Cloud Spanner multi-region configuration
Cloud Spanner multi-region configurations provide strong consistency, zero RPO during normal operation, and automatic failover within <1 minute (typically seconds) in case of regional failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cloud Firestore in multi-region mode
Why it's wrong here
Firestore multi-region provides strong consistency but is not designed for the same throughput and transactional capabilities as Spanner for relational workloads.
- ✗
Cloud Bigtable with multi-cluster routing and replication
Why it's wrong here
Bigtable replication is asynchronous, RPO is not zero, and failover requires manual intervention or DNS routing changes.
- ✗
Cloud SQL with cross-region read replica
Why it's wrong here
Cross-region read replicas are asynchronous, so RPO is not zero, and promotion is manual, taking minutes.
- ✓
Cloud Spanner multi-region configuration
Why this is correct
Spanner multi-region provides synchronous replication across regions, zero RPO, and automatic failover within seconds.
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