Question 912 of 1,031

Describe Azure architecture and services →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is Azure SQL Database, the fully managed PaaS relational database service that directly meets the requirement for built-in high availability, automatic backups, and automatic patching without managing virtual machines or operating systems. This is correct because Azure SQL Database operates as a Platform-as-a-Service (PaaS) offering, meaning Microsoft handles the underlying infrastructure, including OS updates, database engine patching, and geo-replicated storage for 99.99% uptime, while the development team retains full SQL Server compatibility and T-SQL access. On the AZ-900 exam, this scenario tests your ability to distinguish between PaaS database services like Azure SQL Database and IaaS options like SQL Server on Azure VMs—a common trap is choosing SQL on a VM because it sounds familiar, but the question explicitly says "no VM management." Remember the memory tip: if the question says "no OS, no VMs, just the database," think "PaaS SQL Database" for automatic everything.

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 is migrating a customer-facing web application to Azure. The application requires a relational database with built-in high availability, automatic backups, and automatic patching of the database engine. The development team is familiar with SQL Server and wants to minimize administrative overhead. They do not want to manage virtual machines or operating systems. Which Azure database service should the team 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.

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

A
Azure Cosmos DB
Why wrong: Azure Cosmos DB is a globally distributed, multi-model NoSQL database service. It does not natively support SQL Server relational queries (like JOINs) and is designed for non-relational (NoSQL) workloads. Thus, it is not the correct choice for a relational SQL Server-based application.
B
SQL Server on Azure Virtual Machines (IaaS)
Why wrong: SQL Server on Azure VMs is an infrastructure-as-a-service (IaaS) offering. While it provides full control over the SQL Server environment, it requires the team to manage the virtual machines, operating system patches, and SQL Server updates. This does not meet the requirement to minimize administrative overhead.
C
Azure SQL Database (PaaS)
Azure SQL Database is a platform-as-a-service (PaaS) relational database service based on SQL Server. It includes built-in high availability, automatic backups, and automatic patching of the database engine. The team does not need to manage any virtual machines or operating systems, which aligns perfectly with their goal of minimizing administrative overhead.
D
Azure Database for PostgreSQL
Why wrong: Azure Database for PostgreSQL is a managed relational database service, but it uses the PostgreSQL engine, not SQL Server. While it also provides high availability and automatic backups, it does not support the SQL Server dialect or features the development team is familiar with. The requirement states familiarity with SQL Server, so this is not the correct service.

Full breakdown with real-world context →

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 (PaaS)

Azure SQL Database is a fully managed Platform-as-a-Service (PaaS) offering that provides built-in high availability (99.99% SLA), automatic backups with point-in-time restore, and automatic patching of the database engine. It allows the development team to use their existing SQL Server skills without managing any virtual machines or operating systems, directly meeting the requirement to minimize administrative overhead.

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 Cosmos DB
Why it's wrong here
Azure Cosmos DB is a globally distributed, multi-model NoSQL database service. It does not natively support SQL Server relational queries (like JOINs) and is designed for non-relational (NoSQL) workloads. Thus, it is not the correct choice for a relational SQL Server-based application.
✗
SQL Server on Azure Virtual Machines (IaaS)
Why it's wrong here
SQL Server on Azure VMs is an infrastructure-as-a-service (IaaS) offering. While it provides full control over the SQL Server environment, it requires the team to manage the virtual machines, operating system patches, and SQL Server updates. This does not meet the requirement to minimize administrative overhead.
✓
Azure SQL Database (PaaS)
Why this is correct
Azure SQL Database is a platform-as-a-service (PaaS) relational database service based on SQL Server. It includes built-in high availability, automatic backups, and automatic patching of the database engine. The team does not need to manage any virtual machines or operating systems, which aligns perfectly with their goal of minimizing administrative overhead.
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.
✗
Azure Database for PostgreSQL
Why it's wrong here
Azure Database for PostgreSQL is a managed relational database service, but it uses the PostgreSQL engine, not SQL Server. While it also provides high availability and automatic backups, it does not support the SQL Server dialect or features the development team is familiar with. The requirement states familiarity with SQL Server, so this is not the correct service.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse Azure Cosmos DB's 'multi-model' support with relational database capabilities, or they assume IaaS gives more control without realizing the significant administrative overhead it entails, especially when the question explicitly states 'minimize administrative overhead' and 'do not want to manage virtual machines'.

Detailed technical explanation

How to think about this question

Azure SQL Database uses a shared-disk architecture with built-in geo-replication and automatic failover groups to achieve high availability without manual configuration. Automatic patching is handled by the Azure SQL Database platform during maintenance windows, with no downtime for the application when using the Business Critical service tier. In a real-world scenario, a customer-facing web application with strict uptime requirements benefits from the 99.99% SLA and automated backups that can be restored to any point within the last 7-35 days depending on the tier.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

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 (PaaS) — Azure SQL Database is a fully managed Platform-as-a-Service (PaaS) offering that provides built-in high availability (99.99% SLA), automatic backups with point-in-time restore, and automatic patching of the database engine. It allows the development team to use their existing SQL Server skills without managing any virtual machines or operating systems, directly meeting the requirement to minimize administrative overhead.

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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