The answer is Azure SQL Database Serverless. This compute tier is the correct choice because it provides a managed, serverless SQL database that automatically scales compute resources based on real-time workload demand and pauses the database during periods of inactivity, meaning you only pay for storage while paused. On the AZ-900 exam, this question tests your understanding of Azure’s serverless compute options and how they differ from provisioned tiers; a common trap is confusing Azure SQL Database Serverless with Azure SQL Managed Instance or Azure Synapse, which lack the auto-pause feature. To remember it, think of the serverless SQL database as a “smart light” that dims (scales) when you need less light and turns off (pauses) when you leave the room, saving you money.
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.
Which Azure service provides a managed, serverless SQL database that scales automatically and pauses when not in use?
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 Serverless
Azure SQL Database Serverless is the correct answer because it is a compute tier for single databases that automatically scales compute resources based on workload demand and pauses the database during periods of inactivity, charging only for storage when paused. This aligns directly with the question's requirement for a managed, serverless SQL database that scales automatically and pauses when not in use.
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 General Purpose tier
Why it's wrong here
General Purpose runs continuously and doesn't auto-pause; Serverless tier auto-pauses when inactive.
✓
Azure SQL Database Serverless
Why this is correct
SQL Database Serverless automatically scales and pauses when inactive, billing per second for compute used.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Cosmos DB Serverless
Why it's wrong here
Cosmos DB Serverless is a different service; SQL Database Serverless is specifically for Azure SQL.
✗
Azure SQL Managed Instance
Why it's wrong here
SQL Managed Instance runs continuously on dedicated infrastructure; it doesn't have an auto-pause serverless mode.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'serverless' with 'Cosmos DB' because Cosmos DB also offers a serverless mode, but they overlook that the question specifically asks for a SQL database, not a NoSQL database.
Detailed technical explanation
How to think about this question
Under the hood, Azure SQL Database Serverless uses a compute autoscaling range (min and max vCores) and an auto-pause delay (configurable from 1 minute to 7 days) to balance cost and performance. When the database is paused, the compute resources are deallocated, but the data remains in Azure Blob Storage, and the next connection triggers a resume process that typically takes 30–60 seconds. This is ideal for intermittent workloads like development, testing, or infrequently used applications where cost savings are critical.
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.
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 Database Serverless — Azure SQL Database Serverless is the correct answer because it is a compute tier for single databases that automatically scales compute resources based on workload demand and pauses the database during periods of inactivity, charging only for storage when paused. This aligns directly with the question's requirement for a managed, serverless SQL database that scales automatically and pauses when not in use.
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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