The answer is Azure SQL Database Business Critical. This tier is the correct choice because it leverages the full SQL Server database engine with complete T-SQL support for complex queries, while delivering sub-10-millisecond latency for read-heavy workloads through in-memory OLTP and local SSD storage, and it natively supports active geo-replication by provisioning a readable secondary replica in a different Azure region for disaster recovery. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your ability to distinguish between Azure SQL Database service tiers, specifically recognizing that Business Critical is the only tier combining low-latency read performance with geo-replication, whereas the General Purpose tier lacks the local SSD and in-memory capabilities needed for consistent sub-10-millisecond reads. A common trap is choosing Azure SQL Managed Instance, which supports geo-replication but does not guarantee the same sub-10-millisecond latency for read-heavy workloads. Memory tip: think “Business Critical = Business means Big reads, Critical means Consistent latency and Cross-region replication.”
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.
Contoso, Ltd. is migrating a legacy on-premises application to Azure. The application uses a SQL Server database with complex queries and requires read-heavy workloads with sub-10-millisecond latency. The solution must support geo-replication for disaster recovery. Which Azure data service should you recommend?
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 Business Critical
Azure SQL Database Business Critical is correct because it uses SQL Server database engine with full T-SQL support for complex queries, provides read-heavy workloads with sub-10-millisecond latency via in-memory OLTP and local SSD storage, and supports active geo-replication for disaster recovery. This tier offers a readable secondary replica in a different Azure region, meeting both latency and geo-replication 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 Cosmos DB for NoSQL
Why it's wrong here
Cosmos DB is NoSQL and does not support complex SQL queries natively.
✓
Azure SQL Database Business Critical
Why this is correct
Business Critical offers readable secondaries for read-heavy workloads and supports geo-replication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure SQL Database Hyperscale
Why it's wrong here
Hyperscale is for large databases and high throughput, not specifically optimized for read-heavy low-latency.
✗
Azure SQL Managed Instance Business Critical
Why it's wrong here
Managed Instance has limited geo-replication support and higher latency than SQL Database.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Hyperscale for its scalability and geo-replication features, overlooking that its page server architecture introduces higher read latency for small, frequent queries compared to the local SSD-based Business Critical tier.
Detailed technical explanation
How to think about this question
Azure SQL Database Business Critical uses a Always On Availability Groups technology with three synchronous replicas in the same region and one asynchronous replica for geo-replication, ensuring RPO of 5 seconds and RTO of 1 hour. The read-heavy workloads benefit from read-scale out, where the secondary replica can serve read-only queries without impacting primary write performance, achieving sub-10-millisecond latency through local SSD storage and in-memory optimized tables. In real-world scenarios, this tier is ideal for OLTP applications requiring low-latency reads and high availability across regions.
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-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 Business Critical — Azure SQL Database Business Critical is correct because it uses SQL Server database engine with full T-SQL support for complex queries, provides read-heavy workloads with sub-10-millisecond latency via in-memory OLTP and local SSD storage, and supports active geo-replication for disaster recovery. This tier offers a readable secondary replica in a different Azure region, meeting both latency and geo-replication requirements.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This AZ-305 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-305 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.