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 wants to migrate a set of on-premises databases to Azure. They require high compatibility with SQL Server features, including cross-database queries and SQL Agent jobs. They want a PaaS solution. Which Azure service is most appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure SQL Managed Instance
Azure SQL Managed Instance is the correct choice because it provides near 100% compatibility with SQL Server on-premises, including support for cross-database queries and SQL Agent jobs, while being a fully managed Platform-as-a-Service (PaaS) offering. This allows the company to lift-and-shift their databases without redesigning applications, meeting both the feature and PaaS 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
Why it's wrong here
Azure SQL Database is a PaaS service but has limitations on cross-database queries and other features.
✓
Azure SQL Managed Instance
Why this is correct
Managed Instance provides a fully managed SQL Server environment with high compatibility and support for SQL Agent and cross-database queries.
Related concept
Read the scenario before looking for a memorised answer.
✗
SQL Server on Azure Virtual Machines
Why it's wrong here
This is IaaS, not PaaS; the company wants a PaaS solution.
✗
Azure Database for PostgreSQL
Why it's wrong here
This is a different database engine, not compatible with SQL Server features.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure SQL Database (single database) with Azure SQL Managed Instance (instance-scoped features), assuming all Azure SQL PaaS offerings support SQL Agent and cross-database queries, but only Managed Instance provides these capabilities in a PaaS model.
Detailed technical explanation
How to think about this question
Azure SQL Managed Instance runs in its own virtual network (VNet) and uses a dedicated SQL Server engine that supports instance-level features such as SQL Agent, cross-database queries via three-part names (e.g., `db1.schema.table`), and linked servers. It also provides native virtual network integration, allowing secure connectivity to on-premises environments via VPN or ExpressRoute, making it ideal for hybrid migrations with minimal code changes.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
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 Managed Instance — Azure SQL Managed Instance is the correct choice because it provides near 100% compatibility with SQL Server on-premises, including support for cross-database queries and SQL Agent jobs, while being a fully managed Platform-as-a-Service (PaaS) offering. This allows the company to lift-and-shift their databases without redesigning applications, meeting both the feature and PaaS requirements.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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