The answer is Azure SQL Database, the correct choice for a fully managed relational database on Azure with built-in intelligence. This service operates as a Platform-as-a-Service (PaaS) offering, meaning Microsoft handles all underlying infrastructure tasks like patching, backups, and scaling, while providing built-in high availability with a 99.99% SLA and automatic point-in-time restore. Its built-in intelligence includes automatic tuning, adaptive query processing, and intelligent insights that continuously optimize performance without manual intervention, directly matching the startup’s need to minimize administrative overhead. On the AZ-305 exam, this question tests your ability to differentiate PaaS database services from IaaS options like SQL Server on Azure VMs, where you’d manage patching and scaling yourself. A common trap is choosing Azure SQL Managed Instance, which offers more compatibility but adds administrative complexity for features like instance-level patching. Memory tip: think “PaaS with brains” — Azure SQL Database is the only fully managed relational service that tunes itself, so if the scenario emphasizes zero admin and intelligent optimization, it’s the automatic winner.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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 startup is building a new mobile app backend. They need a fully managed relational database service with built-in high availability, automatic backups, and built-in intelligence to optimize performance. They want to minimize administrative overhead for tasks like patching and scaling. Which Azure service should they use?
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.
Azure SQL Database is a fully managed relational database with built-in HA, automated backups, and intelligent performance optimization.
B
SQL Server on Azure Virtual Machines
Why wrong: SQL Server on VMs requires manual configuration for HA, backups, and patching, increasing administrative overhead.
C
Azure Database for MySQL
Why wrong: Azure Database for MySQL is fully managed but is a different relational database engine, not SQL Server; the question does not specify engine but for a new mobile app backend, Azure SQL Database is commonly chosen.
D
Azure Cosmos DB
Why wrong: Cosmos DB is a NoSQL database, not relational, and does not support the relational model required by the scenario.
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
Azure SQL Database is a fully managed Platform-as-a-Service (PaaS) relational database that includes built-in high availability (99.99% SLA), automatic backups with point-in-time restore, and built-in intelligence features like automatic tuning, adaptive query processing, and intelligent insights. This minimizes administrative overhead for patching, scaling, and performance optimization, making it ideal for a startup that wants to focus on app development rather than database management.
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 this is correct
Azure SQL Database is a fully managed relational database with built-in HA, automated backups, and intelligent performance optimization.
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 Machines
Why it's wrong here
SQL Server on VMs requires manual configuration for HA, backups, and patching, increasing administrative overhead.
✗
Azure Database for MySQL
Why it's wrong here
Azure Database for MySQL is fully managed but is a different relational database engine, not SQL Server; the question does not specify engine but for a new mobile app backend, Azure SQL Database is commonly chosen.
✗
Azure Cosmos DB
Why it's wrong here
Cosmos DB is a NoSQL database, not relational, and does not support the relational model required by the scenario.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'fully managed' with 'IaaS' or pick Azure Database for MySQL because it is also fully managed, but they overlook the specific requirement for 'built-in intelligence to optimize performance,' which is a hallmark of Azure SQL Database's automatic tuning features, not available in Azure Database for MySQL.
Trap categories for this question
Scenario analysis trap
Cosmos DB is a NoSQL database, not relational, and does not support the relational model required by the scenario.
Detailed technical explanation
How to think about this question
Azure SQL Database's built-in intelligence includes automatic tuning, which uses machine learning to analyze query performance and automatically create/drop indexes or force plan corrections without manual intervention. Under the hood, it leverages the same SQL Server engine but with a fully managed control plane that handles patching via the Azure update manager, and scaling can be done via the DTU or vCore purchasing models with minimal downtime. In a real-world scenario, a startup can use the 'Intelligent Insights' feature to receive proactive performance diagnostics and recommendations, reducing the need for a dedicated DBA.
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-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure SQL Database — Azure SQL Database is a fully managed Platform-as-a-Service (PaaS) relational database that includes built-in high availability (99.99% SLA), automatic backups with point-in-time restore, and built-in intelligence features like automatic tuning, adaptive query processing, and intelligent insights. This minimizes administrative overhead for patching, scaling, and performance optimization, making it ideal for a startup that wants to focus on app development rather than database management.
What should I do if I get this AZ-305 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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Question Discussion
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