- A
Azure SQL Database with a single database.
Why wrong: Single database in Azure SQL has scaling limits and is not designed for global distribution with low latency across regions.
- B
Azure Cosmos DB with a multi-master configuration and partition on user ID.
Cosmos DB provides global distribution, multi-master writes, and single-digit millisecond latency, ideal for high-throughput NoSQL workloads.
- C
Azure Blob Storage with append blobs.
Why wrong: Blob Storage is for large binary data, not for high-frequency small writes of text updates, and appending is not efficient for random access.
- D
Azure Table Storage with user ID as partition key and timestamp as row key.
Why wrong: Table Storage is a good NoSQL option but lacks built-in multi-region writes and global distribution capabilities for latency-sensitive apps.
Quick Answer
The answer is Azure Cosmos DB with a multi-master configuration and partition on user ID. This is correct because Cosmos DB’s multi-master setup enables global distribution with multiple write regions, allowing the app to scale horizontally and handle high write throughput while providing low-latency reads worldwide; partitioning on user ID ensures even data distribution across physical partitions, which is critical for sustaining that throughput as the user base grows. On the DP-900 exam, this scenario tests your understanding of when to choose a globally distributed NoSQL database over alternatives like Azure SQL Database or Table Storage—a common trap is picking a single-region service for a globally scaling app. Remember the key pairing: for high throughput and global scaling, think “Cosmos DB + multi-master + partition key on the high-cardinality field.” A useful mnemonic is “CMP” for Cosmos, Multi-master, Partition—three pillars of global scale.
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 startup is building a mobile app that allows users to share short text updates. Each update includes a user ID, timestamp, and message text. The development team expects rapid growth and needs a storage solution that can scale horizontally, handle high write throughput, and provide low-latency reads globally. Which Azure data service is most appropriate?
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
Azure Cosmos DB with a multi-master configuration and partition on user ID.
Azure Cosmos DB with a multi-master configuration is the most appropriate choice because it provides global distribution with multiple write regions, enabling horizontal scaling and low-latency reads and writes worldwide. Partitioning on user ID ensures even data distribution and efficient query performance for the app's high write throughput requirements.
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.
- ✗
Azure SQL Database with a single database.
Why it's wrong here
Single database in Azure SQL has scaling limits and is not designed for global distribution with low latency across regions.
- ✓
Azure Cosmos DB with a multi-master configuration and partition on user ID.
Why this is correct
Cosmos DB provides global distribution, multi-master writes, and single-digit millisecond latency, ideal for high-throughput NoSQL workloads.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Blob Storage with append blobs.
Why it's wrong here
Blob Storage is for large binary data, not for high-frequency small writes of text updates, and appending is not efficient for random access.
- ✗
Azure Table Storage with user ID as partition key and timestamp as row key.
Why it's wrong here
Table Storage is a good NoSQL option but lacks built-in multi-region writes and global distribution capabilities for latency-sensitive apps.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Table Storage's horizontal scaling with the global, multi-master capabilities of Cosmos DB, assuming Table Storage can provide low-latency writes worldwide when it lacks native multi-region write support and has higher latency for cross-region scenarios.
Detailed technical explanation
How to think about this question
Cosmos DB's multi-master configuration uses a multi-region writes protocol that allows any region to accept writes, which are then asynchronously replicated to other regions using a conflict-resolution mechanism (e.g., last-writer-wins). Partitioning on user ID ensures that all updates for a given user are stored in the same physical partition, enabling efficient point reads and writes with predictable performance, while the request unit (RU) model allows throughput to be scaled independently per partition.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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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Describe core data concepts — study guide chapter
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FAQ
Questions learners often ask
What does this DP-900 question test?
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Cosmos DB with a multi-master configuration and partition on user ID. — Azure Cosmos DB with a multi-master configuration is the most appropriate choice because it provides global distribution with multiple write regions, enabling horizontal scaling and low-latency reads and writes worldwide. Partitioning on user ID ensures even data distribution and efficient query performance for the app's high write throughput requirements.
What should I do if I get this DP-900 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: Jun 11, 2026
This DP-900 practice question is part of Courseiva's free Microsoft 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 DP-900 exam.
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