- A
Read-your-writes consistency from the primary
Why wrong: While the primary cluster provides read-your-writes consistency, the question is about the replica cluster.
- B
Eventually consistent reads from replicas
Bigtable uses async replication, so replicas are eventually consistent. This is the expected behavior.
- C
Strongly consistent reads from any cluster
Why wrong: Bigtable replication is eventually consistent; reads from replicas may not reflect the latest writes.
- D
Strict serializability across clusters
Why wrong: Strict serializability is not provided by Bigtable replication; it is an eventually consistent system.
Question 429 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
You have a Cloud Bigtable instance with a single cluster. To improve availability and durability, you want to enable replication across two regions. After configuring replication, you notice that reads from the replica cluster show data that is not yet consistent with the primary. What is the expected consistency model for Bigtable replication?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
✓
Eventually consistent reads from replicas
Cloud Bigtable replication uses an eventually consistent model for reads from replica clusters. When you write to the primary cluster, the data is asynchronously replicated to the replica cluster using a distributed replication pipeline. This means that reads from the replica cluster may return stale data until the replication process completes, and there is no guarantee of immediate consistency with the primary.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Read-your-writes consistency from the primary
Why it's wrong here
While the primary cluster provides read-your-writes consistency, the question is about the replica cluster.
- ✓
Eventually consistent reads from replicas
Why this is correct
Bigtable uses async replication, so replicas are eventually consistent. This is the expected behavior.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Strongly consistent reads from any cluster
Why it's wrong here
Bigtable replication is eventually consistent; reads from replicas may not reflect the latest writes.
- ✗
Strict serializability across clusters
Why it's wrong here
Strict serializability is not provided by Bigtable replication; it is an eventually consistent system.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that replication in Bigtable provides strong consistency across all clusters, similar to a synchronous replication setup, when in fact it is eventually consistent and only the primary cluster guarantees strong consistency.
Detailed technical explanation
How to think about this question
Bigtable replication uses a multi-master model where each cluster can accept writes, but by default you designate one cluster as the primary for application writes. Replication is asynchronous and uses a distributed log-based mechanism; the replication lag can vary based on network latency, load, and the number of tablets. In a real-world scenario, if you need strong consistency for reads, you must direct all reads to the primary cluster, and use replicas only for disaster recovery or read offloading where stale data is acceptable.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Manage Database Solutions — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Manage Database Solutions — This question tests Manage Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Eventually consistent reads from replicas — Cloud Bigtable replication uses an eventually consistent model for reads from replica clusters. When you write to the primary cluster, the data is asynchronously replicated to the replica cluster using a distributed replication pipeline. This means that reads from the replica cluster may return stale data until the replication process completes, and there is no guarantee of immediate consistency with the primary.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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