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PCDE Practice Question: Deploy scalable and highly available databases in Google Cloud
A company uses Cloud Bigtable with replication across two regions. They want to implement a DR plan that minimizes RPO and RTO. Which TWO steps should they take? (Choose 2)
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
✓
Configure multi-cluster routing with read-failover.
Using multi-cluster routing with read-failover ensures reads automatically switch to the secondary cluster when primary is unhealthy, minimizing RPO by directing writes to primary. Regularly testing failover validates the process and updates runbooks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure multi-cluster routing with read-failover.
Why this is correct
This ensures reads fail over automatically while writes remain in primary, minimizing RPO.
- ✓
Regularly perform failover drills using Cloud DNS health checks to update routing.
Why this is correct
Failover drills validate the process and help meet RTO targets.
- ✗
Enable automatic failover for writes in the Bigtable cluster configuration.
Why it's wrong here
Bigtable does not support automatic write failover; it must be done manually via routing policy.
- ✗
Set the replication routing policy to any-replica.
Why it's wrong here
any-replica allows writes to both clusters, potentially causing conflicts and not minimizing RPO.
- ✗
Set the replication routing policy to single-cluster with failover priority.
Why it's wrong here
This only affects which cluster receives traffic on failover; does not minimize RPO.
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