- A
Order management: Azure Cosmos DB (NoSQL API) - Product catalog: Azure SQL Database - Session store: Azure Table Storage
Why wrong: Cosmos DB (NoSQL API) does not inherently support multi-table ACID transactions across different containers (unless using transactional batch with limitations). Azure SQL Database is not ideal for a read-heavy, flexible-schema product catalog. Azure Table Storage provides key-value storage but with higher latency than a caching solution.
- B
Order management: Azure SQL Database - Product catalog: Azure Cosmos DB (NoSQL API) - Session store: Azure Cache for Redis
Azure SQL Database provides strong ACID transactions for orders. Cosmos DB with NoSQL API offers flexible schema and low-latency reads for the product catalog. Azure Cache for Redis delivers sub-millisecond key-value lookups ideal for session state with eventual consistency.
- C
Order management: Azure Table Storage - Product catalog: Azure SQL Database - Session store: Azure Cosmos DB (NoSQL API)
Why wrong: Azure Table Storage does not support ACID transactions across multiple tables; it is a key-value store with limited consistency. Azure SQL Database is not optimal for a flexible-schema catalog. Cosmos DB can serve as a session store but its latencies are typically higher than a dedicated cache like Redis.
- D
Order management: Azure Cosmos DB (Table API) - Product catalog: Azure Cache for Redis - Session store: Azure SQL Database
Why wrong: Cosmos DB Table API is a key-value/table store without multi-table ACID transactions. Azure Cache for Redis is an in-memory cache, not a persistent catalog store. Azure SQL Database is too slow and over-provisioned for a simple session key-value store.
Quick Answer
The correct pairing is Azure SQL Database for order management, Azure Cosmos DB (NoSQL API) for the product catalog, and Azure Cache for Redis for the session store. This works because Azure SQL Database enforces full ACID transactions across tables like Orders and Inventory, while Cosmos DB’s flexible schema handles varying product attributes with high read throughput, and Redis provides sub-millisecond key-value lookups with eventual consistency for session data. On the DP-900 exam, this scenario tests your ability to match transactional versus analytical workloads to the right Azure data services—a common trap is choosing Azure SQL Database for the catalog due to its relational familiarity, but remember that Cosmos DB excels at schema-less, read-heavy workloads. A useful memory tip: think “SQL for strict rules, Cosmos for flexible shapes, Redis for lightning speed.”
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.
A global e-commerce platform uses a combination of relational and NoSQL databases. The order management system requires ACID transactions across multiple tables (Orders, OrderItems, Inventory). The product catalog uses a flexible schema to accommodate varying product attributes and is read-heavy. The session store requires low-latency key-value lookups with eventual consistency. Which of the following pairings of data stores best matches these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Order management: Azure SQL Database - Product catalog: Azure Cosmos DB (NoSQL API) - Session store: Azure Cache for Redis
Option B is correct because Azure SQL Database provides full ACID transaction support across multiple tables, making it ideal for order management. Azure Cosmos DB (NoSQL API) offers a flexible schema and high read throughput for the product catalog. Azure Cache for Redis delivers sub-millisecond key-value lookups with eventual consistency, perfect for session storage.
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.
- ✗
Order management: Azure Cosmos DB (NoSQL API) - Product catalog: Azure SQL Database - Session store: Azure Table Storage
Why it's wrong here
Cosmos DB (NoSQL API) does not inherently support multi-table ACID transactions across different containers (unless using transactional batch with limitations). Azure SQL Database is not ideal for a read-heavy, flexible-schema product catalog. Azure Table Storage provides key-value storage but with higher latency than a caching solution.
- ✓
Order management: Azure SQL Database - Product catalog: Azure Cosmos DB (NoSQL API) - Session store: Azure Cache for Redis
Why this is correct
Azure SQL Database provides strong ACID transactions for orders. Cosmos DB with NoSQL API offers flexible schema and low-latency reads for the product catalog. Azure Cache for Redis delivers sub-millisecond key-value lookups ideal for session state with eventual consistency.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Order management: Azure Table Storage - Product catalog: Azure SQL Database - Session store: Azure Cosmos DB (NoSQL API)
Why it's wrong here
Azure Table Storage does not support ACID transactions across multiple tables; it is a key-value store with limited consistency. Azure SQL Database is not optimal for a flexible-schema catalog. Cosmos DB can serve as a session store but its latencies are typically higher than a dedicated cache like Redis.
- ✗
Order management: Azure Cosmos DB (Table API) - Product catalog: Azure Cache for Redis - Session store: Azure SQL Database
Why it's wrong here
Cosmos DB Table API is a key-value/table store without multi-table ACID transactions. Azure Cache for Redis is an in-memory cache, not a persistent catalog store. Azure SQL Database is too slow and over-provisioned for a simple session key-value store.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume NoSQL databases like Cosmos DB can handle ACID transactions across multiple tables, but in reality, Cosmos DB only guarantees atomicity within a single document or stored procedure, not across separate containers or tables.
Detailed technical explanation
How to think about this question
Azure SQL Database uses snapshot isolation and write-ahead logging to guarantee ACID properties across tables in a single database. Azure Cosmos DB (NoSQL API) supports automatic indexing and tunable consistency levels, including eventual consistency, to optimize read-heavy workloads. Azure Cache for Redis stores data in-memory using a key-value model with O(1) lookup time, and its built-in expiration policies make it ideal for session management.
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: Order management: Azure SQL Database - Product catalog: Azure Cosmos DB (NoSQL API) - Session store: Azure Cache for Redis — Option B is correct because Azure SQL Database provides full ACID transaction support across multiple tables, making it ideal for order management. Azure Cosmos DB (NoSQL API) offers a flexible schema and high read throughput for the product catalog. Azure Cache for Redis delivers sub-millisecond key-value lookups with eventual consistency, perfect for session storage.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 →
Same concept, more angles
2 more ways this is tested on DP-900
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. You design a data solution for an e-commerce platform. Transactional data must be stored with ACID compliance for order processing, while clickstream data from the website will be used for analytics. Which combination of Azure data services best meets these needs?
medium- A.Azure Cosmos DB for transactions; Azure SQL Database for analytics
- ✓ B.Azure SQL Database for transactions; Azure Synapse Analytics for analytics
- C.Azure Blob Storage for transactions; Azure Data Lake Storage for analytics
- D.Azure Database for MySQL for transactions; Azure Analysis Services for analytics
Why B: Azure SQL Database provides full ACID compliance for transactional workloads like order processing, ensuring data integrity. Azure Synapse Analytics is optimized for large-scale analytics on clickstream data, offering massively parallel processing (MPP) and integration with data lakes. This combination separates OLTP and OLAP workloads efficiently.
Variation 2. You need to design a data storage solution for an e-commerce platform that requires ACID transactions for order processing and high availability across regions. Which Azure service meets these requirements?
medium- A.Azure Database for MySQL with read replicas
- B.Azure Synapse Analytics
- ✓ C.Azure SQL Database with active geo-replication
- D.Azure Cosmos DB with multiple write regions
Why C: Azure SQL Database with active geo-region replication supports ACID transactions natively and provides automatic failover to a secondary region, ensuring high availability across regions. This meets the e-commerce platform's need for transactional consistency and regional resilience.
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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