- A
Denormalize by storing orders as multiple columns or a serialized column in the Users row
Denormalization avoids joins; storing orders within the user row allows single-row reads for all orders.
- B
Maintain 3NF to avoid data duplication
Why wrong: Bigtable is NoSQL; normalization is counterproductive — denormalization is recommended.
- C
Use a row key that includes a hash prefix to distribute writes
Salting prevents hotspots when rows are inserted in order.
- D
Keep the foreign key relationship by storing UserId in the Orders row key
Why wrong: This still requires multiple row reads for a user's orders; denormalization is preferred.
- E
Create a separate column family for user attributes and orders
Column families help organize data and can be optimized for different access patterns.
PCDOE Design and Plan Database Solutions Practice Question
This PCDOE practice question tests your understanding of design and plan 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.
You are migrating a relational database to Cloud Bigtable. The source schema has a Users table and an Orders table with a one-to-many relationship. The application frequently queries all orders for a user. Which three Bigtable schema design practices should you apply?
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
Denormalize by storing orders as multiple columns or a serialized column in the Users row
Option A is correct because Cloud Bigtable is a wide-column NoSQL database that does not support joins. To efficiently query all orders for a user, you must denormalize the one-to-many relationship by storing orders as multiple columns (e.g., order_1, order_2) or as a serialized JSON/protobuf column within the user's row. This avoids the need for a separate lookup or join, enabling single-row reads for the user's orders.
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.
- ✓
Denormalize by storing orders as multiple columns or a serialized column in the Users row
Why this is correct
Denormalization avoids joins; storing orders within the user row allows single-row reads for all orders.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Maintain 3NF to avoid data duplication
Why it's wrong here
Bigtable is NoSQL; normalization is counterproductive — denormalization is recommended.
- ✓
Use a row key that includes a hash prefix to distribute writes
Why this is correct
Salting prevents hotspots when rows are inserted in order.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep the foreign key relationship by storing UserId in the Orders row key
Why it's wrong here
This still requires multiple row reads for a user's orders; denormalization is preferred.
- ✓
Create a separate column family for user attributes and orders
Why this is correct
Column families help organize data and can be optimized for different access patterns.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that relational normalization principles apply to NoSQL databases, but in Bigtable, denormalization and row-key design are critical for performance, and maintaining foreign keys or 3NF leads to inefficient scans and poor latency.
Detailed technical explanation
How to think about this question
Bigtable stores data in lexicographically sorted rows, so a row key like UserId#OrderId (with a hash prefix for distribution) allows you to scan all orders for a user by reading the contiguous range of rows starting with that UserId. Denormalization in Bigtable often uses column qualifiers to represent individual orders (e.g., order:12345) within a column family, enabling efficient retrieval without serialization overhead. The choice between multiple columns and a serialized column depends on whether you need to query individual order fields or always fetch the entire order set.
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.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Design and Plan Database Solutions — This question tests Design and Plan Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Denormalize by storing orders as multiple columns or a serialized column in the Users row — Option A is correct because Cloud Bigtable is a wide-column NoSQL database that does not support joins. To efficiently query all orders for a user, you must denormalize the one-to-many relationship by storing orders as multiple columns (e.g., order_1, order_2) or as a serialized JSON/protobuf column within the user's row. This avoids the need for a separate lookup or join, enabling single-row reads for the user's orders.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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