PCDE Practice Question: Manage a solution that can span multiple database technologies
A Cloud Bigtable instance is configured with asynchronous replication across two regions for disaster recovery. The team needs to ensure that read-after-write consistency is maintained within a region. Which three strategies should they implement? (Choose THREE.)
⚠ Common exam trap
Watch out — candidates often confuse asynchronous replication with eventual consistency and assume that monitoring replication lag alone can guarantee read-after-write consistency, when in fact only application-level write confirmation and single-cluster routing provide that guarantee within a region.
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
✓
After writing, have the application wait for a confirmation that the write is durable before performing a read.
In Cloud Bigtable, writes are acknowledged only after they are committed to the tablet server's log and replicated to the underlying Colossus file system. By waiting for this confirmation before performing a read, the application ensures that the read will see the latest write, providing read-after-write consistency within the region.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
After writing, have the application wait for a confirmation that the write is durable before performing a read.
Why this is correct
Application-level confirmation ensures consistency.
- ✓
Use single-cluster routing for read/write operations within the primary region.
Why this is correct
Ensures reads see recent writes within the same cluster.
- ✗
Disable replication and use only the primary cluster.
Why it's wrong here
Would lose DR capability.
- ✗
Use multi-cluster routing to distribute reads across regions.
Why it's wrong here
May read from a replica that hasn't caught up.
- ✓
Monitor replication lag metrics to ensure replicas are up to date.
Why this is correct
Helps detect when replicas are lagging.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.