- A
Serving as a transaction processing database for an e-commerce website
Bigtable is not designed for transaction processing; it lacks ACID transactions and secondary indexes for complex queries.
- B
Analyzing ad-tech clickstream data
Why wrong: Bigtable is used for ad-tech clickstream data.
- C
Storing time-series data from IoT sensors
Why wrong: Bigtable is commonly used for time-series data.
- D
Powering a financial market data feed with millisecond latency
Why wrong: Bigtable is well-suited for financial market data.
Question 822 of 980
PCD Practice Question: Design Scalable and Highly Available Cloud Database Solutions
This PCD practice question tests your understanding of design scalable and highly available cloud database solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which of the following is NOT a valid use case for Cloud Bigtable?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"NOT"Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
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
✓
Serving as a transaction processing database for an e-commerce website
Cloud Bigtable is a NoSQL, wide-column database optimized for high-throughput, low-latency analytical and operational workloads, but it does not support multi-row transactions or ACID guarantees. Therefore, it is not suitable as a transaction processing database for an e-commerce website, which requires strong consistency and transactional integrity for order management and inventory updates.
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.
- ✓
Serving as a transaction processing database for an e-commerce website
Why this is correct
Bigtable is not designed for transaction processing; it lacks ACID transactions and secondary indexes for complex queries.
Clue confirmation
The clue word "NOT" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Analyzing ad-tech clickstream data
Why it's wrong here
Bigtable is used for ad-tech clickstream data.
- ✗
Storing time-series data from IoT sensors
Why it's wrong here
Bigtable is commonly used for time-series data.
- ✗
Powering a financial market data feed with millisecond latency
Why it's wrong here
Bigtable is well-suited for financial market data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any high-performance database can serve as a transaction processing system, but the trap here is that Bigtable's lack of ACID transactions and multi-row atomicity disqualifies it from e-commerce use cases, even though it excels at high-throughput, low-latency analytical workloads.
Detailed technical explanation
How to think about this question
Bigtable uses a distributed, sharded architecture based on Google's Chubby lock service and SSTables, providing strong consistency for single-row reads and writes but only eventual consistency for multi-row operations. It is accessed via the HBase API or the Bigtable-specific gRPC interface, and its lack of multi-row transactions and secondary indexes makes it unsuitable for OLTP workloads like e-commerce, which rely on ACID compliance and relational queries.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
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FAQ
Questions learners often ask
What does this PCD question test?
Design Scalable and Highly Available Cloud Database Solutions — This question tests Design Scalable and Highly Available Cloud Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Serving as a transaction processing database for an e-commerce website — Cloud Bigtable is a NoSQL, wide-column database optimized for high-throughput, low-latency analytical and operational workloads, but it does not support multi-row transactions or ACID guarantees. Therefore, it is not suitable as a transaction processing database for an e-commerce website, which requires strong consistency and transactional integrity for order management and inventory updates.
What should I do if I get this PCD 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: "NOT". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCD 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 PCD exam.
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