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Deploy scalable and highly available databases in Google Cloud →mediumMultiple ChoiceObjective-mapped
PCDE Practice Question: Deploy scalable and highly available databases in Google Cloud
A media streaming company uses Cloud Bigtable to store user session data with a single cluster in us-east1. They want to add disaster recovery capability with an RPO of no more than 5 minutes and an RTO of under 10 minutes. Which action should they take?
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
✓
Add a second cluster in a different region with replication, and configure a Cloud DNS health check to redirect traffic
Bigtable replication allows adding a second cluster in a different region with asynchronous replication. The replication lag can be within seconds, typically under 5 minutes. For RTO under 10 minutes, manual failover via the Cloud Console or CLI is sufficient; automatic failover is not built-in but can be achieved with external orchestration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Cloud SQL cross-region read replicas
Why it's wrong here
Cloud SQL is not suitable for Bigtable workloads; this is a different service.
- ✗
Deploy a new Bigtable instance in another region and set up dataflow pipelines to replicate data
Why it's wrong here
This is overly complex and may not meet RPO/RTO as easily as native replication.
- ✗
Create an on-demand backup and restore to another region
Why it's wrong here
Backup restore RPO equals the backup age, which would likely exceed 5 minutes unless backups are very frequent, and RTO for restoring a backup can be hours.
- ✓
Add a second cluster in a different region with replication, and configure a Cloud DNS health check to redirect traffic
Why this is correct
Adding a replicated cluster in another region and using a health-check-based DNS routing can achieve RPO < 5 minutes and RTO < 10 minutes.
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Last reviewed: Jul 4, 2026
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