The answer is consistency model requirements, along with data model flexibility and workload transactional needs. This is correct because Azure SQL Database enforces a fixed relational schema and strong consistency by default, making it ideal for structured data and ACID transactions, whereas Azure Cosmos DB is schema-agnostic and offers multiple consistency levels—from strong to eventual—allowing you to tune performance and availability for globally distributed, document-based workloads. On the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your ability to match database capabilities to application requirements, often appearing as a scenario where you must choose between relational and NoSQL options. A common trap is focusing only on cost or speed, while the core distinction lies in schema rigidity and consistency trade-offs. For a memory tip, remember: “SQL is strict and consistent; Cosmos is flexible and tunable.”
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 THREE factors should you consider when choosing between Azure SQL Database and Azure Cosmos DB for a new application? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Schema flexibility
Option A is correct because Azure SQL Database requires a fixed relational schema, whereas Azure Cosmos DB is schema-agnostic and supports flexible, document-based data models. This makes Cosmos DB ideal for applications with evolving or unstructured data, while SQL Database suits strictly relational workloads.
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.
✓
Schema flexibility
Why this is correct
Cosmos DB is schema-agnostic; SQL Database requires a defined schema.
Related concept
Read the scenario before looking for a memorised answer.
✓
Global distribution needs
Why this is correct
Cosmos DB is natively globally distributed; SQL Database requires geo-replication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cost per GB
Why it's wrong here
Cost is generally a consideration but not a key differentiator; both have different pricing models.
✗
Maximum data size
Why it's wrong here
Both can handle large data sizes; not a deciding factor.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse cost or storage limits as key differentiators, but the DP-900 exam focuses on schema flexibility, global distribution, and consistency models as the core architectural trade-offs between these two services.
Detailed technical explanation
How to think about this question
Azure Cosmos DB offers multiple consistency models (strong, bounded staleness, session, consistent prefix, eventual) that directly impact read latency and availability, while Azure SQL Database provides only strong consistency (ACID transactions). For globally distributed applications, Cosmos DB's turnkey multi-region writes with automatic failover contrast with SQL Database's active geo-replication, which requires manual configuration and has different RPO/RTO guarantees.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
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: Schema flexibility — Option A is correct because Azure SQL Database requires a fixed relational schema, whereas Azure Cosmos DB is schema-agnostic and supports flexible, document-based data models. This makes Cosmos DB ideal for applications with evolving or unstructured data, while SQL Database suits strictly relational workloads.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE factors should you consider when choosing between Azure SQL Database and Azure Cosmos DB for a new application?
hard
✓ A.Need for multi-region writes
✓ B.Schema flexibility requirements
✓ C.Transaction consistency requirements
D.Support for JSON data
E.Support for T-SQL queries
Why A: Option A is correct because Azure Cosmos DB supports multi-region writes with its multi-master replication, enabling low-latency writes across multiple geographic regions, which is a key differentiator from Azure SQL Database that only supports a single write region. This is critical for globally distributed applications requiring high availability and local write performance.
Last reviewed: Jun 24, 2026
Question Discussion
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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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