- A
Azure SQL Database (Platform-as-a-Service)
Correct. Azure SQL Database is a PaaS relational database that fully manages the underlying infrastructure, including automatic OS/engine patching and backups. It supports independent scaling of compute and storage, meeting all stated requirements.
- B
SQL Server on Azure Virtual Machine (Infrastructure-as-a-Service)
Why wrong: Incorrect. SQL Server on an Azure VM (IaaS) requires the customer to manage the operating system, SQL Server patching, and backup configuration. While possible, it increases administrative overhead and does not align with the goal of minimizing management tasks.
- C
Azure Cosmos DB
Why wrong: Incorrect. Azure Cosmos DB is a globally distributed NoSQL database service. It supports multiple APIs (e.g., SQL API, MongoDB) but is not a relational database and does not support the same SQL Server Transact-SQL (T-SQL) features that the existing application likely depends on. The scenario specifies a SQL Server database.
- D
Azure Database for MySQL
Why wrong: Incorrect. Azure Database for MySQL is a fully managed MySQL database service, but the existing application uses SQL Server. Migrating to a different database engine would require significant application changes, and the scenario does not indicate such a need.
Quick Answer
The answer is Azure SQL Database. This Platform-as-a-Service (PaaS) offering is the correct choice because it fully manages the underlying operating system and database engine, handling all patching and updates automatically, while also providing automated backups with point-in-time restore—directly meeting the team’s goal to minimize administrative overhead. Unlike SQL Server on a VM, which requires you to manage the virtual machine and its OS, Azure SQL Database allows independent scaling of compute and storage without any VM management, perfectly supporting the 500 GB database and 50 concurrent users. On the AZ-900 exam, this scenario tests your understanding of the shared responsibility model: PaaS shifts OS and database patching to Microsoft, while IaaS (SQL Server on VM) leaves that work on you. A common trap is choosing SQL Server on a VM because it feels more familiar, but the question explicitly demands minimized overhead and automated backups. Memory tip: “PaaS patches, IaaS installs”—if the question says “no VM management,” think PaaS.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 company runs an on-premises line-of-business application that uses a SQL Server database. The database currently has 500 GB of data and is accessed by 50 users simultaneously. The company is planning to migrate this database to Azure. The IT team wants to minimize administrative overhead for patching the operating system and database engine, and for performing automated backups with point-in-time restore. The team also wants the ability to scale compute and storage independently without managing virtual machines. Which Azure service should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 SQL Database (Platform-as-a-Service)
Azure SQL Database is a Platform-as-a-Service (PaaS) offering that fully manages the underlying operating system and SQL Server engine, including patching and updates. It provides automated backups with point-in-time restore (up to 35 days retention) and allows independent scaling of compute (DTUs/vCores) and storage without any virtual machine management. This directly meets the team's requirements to minimize administrative overhead while supporting 500 GB of data and 50 concurrent users.
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 (Platform-as-a-Service)
Why this is correct
Correct. Azure SQL Database is a PaaS relational database that fully manages the underlying infrastructure, including automatic OS/engine patching and backups. It supports independent scaling of compute and storage, meeting all stated requirements.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SQL Server on Azure Virtual Machine (Infrastructure-as-a-Service)
- ✗
Azure Cosmos DB
Why it's wrong here
Incorrect. Azure Cosmos DB is a globally distributed NoSQL database service. It supports multiple APIs (e.g., SQL API, MongoDB) but is not a relational database and does not support the same SQL Server Transact-SQL (T-SQL) features that the existing application likely depends on. The scenario specifies a SQL Server database.
- ✗
Azure Database for MySQL
Why it's wrong here
Incorrect. Azure Database for MySQL is a fully managed MySQL database service, but the existing application uses SQL Server. Migrating to a different database engine would require significant application changes, and the scenario does not indicate such a need.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the managed IaaS option (SQL Server on Azure VM) with PaaS, thinking it also automates patching and backups, but in reality, IaaS leaves all OS and DB engine maintenance to the customer.
Trap categories for this question
Scenario analysis trap
Incorrect. Azure Cosmos DB is a globally distributed NoSQL database service. It supports multiple APIs (e.g., SQL API, MongoDB) but is not a relational database and does not support the same SQL Server Transact-SQL (T-SQL) features that the existing application likely depends on. The scenario specifies a SQL Server database.
Detailed technical explanation
How to think about this question
Azure SQL Database uses a shared-architecture model where compute and storage are decoupled; storage is backed by Azure Premium Blob Storage with built-in geo-redundancy, and compute can be scaled via the DTU or vCore purchasing models independently. Automated backups use SQL Database's built-in backup service, which creates full, differential, and transaction log backups every 5-10 minutes, enabling point-in-time restore to any point within the retention window. In a real-world scenario, a company migrating a 500 GB database would benefit from the Hyperscale service tier, which allows rapid scaling of compute nodes and storage up to 100 TB without downtime.
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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FAQ
Questions learners often ask
What does this AZ-900 question test?
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure SQL Database (Platform-as-a-Service) — Azure SQL Database is a Platform-as-a-Service (PaaS) offering that fully manages the underlying operating system and SQL Server engine, including patching and updates. It provides automated backups with point-in-time restore (up to 35 days retention) and allows independent scaling of compute (DTUs/vCores) and storage without any virtual machine management. This directly meets the team's requirements to minimize administrative overhead while supporting 500 GB of data and 50 concurrent users.
What should I do if I get this AZ-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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 AZ-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 AZ-900 exam.
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