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GCDL Practice Question: A developer is building a real-time collaborative…
This GCDL practice question tests your understanding of a developer is building a real-time collaborative…. 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.
A developer is building a real-time collaborative document editing application (similar to Google Docs). Users must see each other's edits instantly. Which data consistency model is required for this use case, and what is the implication for the database choice?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
This workload requires a relational database because only SQL can handle concurrent user edits correctly
Relational databases are not the only option. Specialized real-time databases (Firestore, Supabase Realtime) and synchronization protocols (CRDTs) can handle concurrent collaborative editing without traditional SQL.
B
Distractor review
Consistency doesn't matter for this use case because each user edits different parts of the document
In collaborative editing, users actively edit the same content. Cursor positions, text insertions, and deletions from multiple users must be merged consistently. Consistency is critical, not irrelevant.
C
Distractor review
Eventual consistency is acceptable because users will eventually see each other's edits after a short delay, and this enables higher performance
For collaborative document editing, eventual consistency causes visible conflicts — User A sees 'Hello World' while User B sees 'Hello' simultaneously. This is unacceptable UX. Real-time collaboration requires tight consistency guarantees or specialized sync mechanisms.
D
Best answer
Strong consistency or real-time synchronization is required so all users see the same document state simultaneously; this rules out eventually consistent NoSQL stores and pushes toward strongly consistent databases or specialized collaboration protocols
Real-time collaboration requires that edits are applied in a consistent order visible to all users simultaneously. Eventually consistent databases (like Cassandra in default mode) would show different users different states of the document. This workload requires either strongly consistent storage or specialized real-time sync protocols (Operational Transformation, CRDTs) that handle concurrent edits correctly.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Related practice questions
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More questions from this exam
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Question 1
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Question 2
An e-commerce company plans its infrastructure for peak shopping events (e.g., Black Friday) which drive 50× normal traffic. On-premises, they must maintain 50× capacity year-round. In the cloud, they provision 50× capacity only during peak periods. Which cloud characteristic enables this cost optimization?
Question 3
Which term describes the process by which organizations integrate digital technology into all areas of their business, fundamentally changing how they operate and deliver value to customers?
Question 4
When a company moves from maintaining its own data center to using Google Cloud, which operational responsibility does Google assume that the company previously managed?
Question 5
A hospital runs a patient records system that must remain on-premises due to strict regulatory data residency requirements. However, they also want to use cloud-based AI for diagnostic imaging analysis. Which cloud deployment model best describes their architecture?
Question 6
What is virtualization in the context of cloud computing, and why is it fundamental to how cloud providers deliver services?
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FAQ
Questions learners often ask
What does this GCDL question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Strong consistency or real-time synchronization is required so all users see the same document state simultaneously; this rules out eventually consistent NoSQL stores and pushes toward strongly consistent databases or specialized collaboration protocols — Real-time collaborative editing requires strong consistency or, more precisely, real-time synchronization — all users must see the same current state. Eventual consistency, where different replicas may temporarily show different values, would cause users to see contradictory states of the document. This pushes toward strongly consistent databases or specialized collaborative synchronization protocols (CRDTs).
What should I do if I get this GCDL question wrong?
Identify which GCDL exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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This GCDL 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 GCDL exam.