The answer is Read Scale-Out. This Azure SQL Database feature is the correct choice because it offloads reporting queries to a read-only replica that is kept synchronously committed within the same Azure region, ensuring zero data loss for read workloads while reducing load on the primary. Additionally, if the primary database fails, Read Scale-Out provides automated failover to that read-only replica, meeting both the synchronous sync and high-availability requirements for Premium-tier databases. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this scenario tests your ability to distinguish between read-only replicas for reporting and geo-replication for disaster recovery—a common trap is confusing Read Scale-Out with Active Geo-Replication, which is asynchronous and cross-region. Remember: if the question specifies “same region” and “synchronous sync,” think Read Scale-Out; for cross-region async, think Geo-Replication. Memory tip: “Same region, sync commit—Read Scale-Out is it.”
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses Azure SQL Database (Premium tier) for their application. They need to offload reporting queries to a read-only copy of the database to reduce load on the primary. The read-only copy must be kept in sync synchronously within the same Azure region. They also need automated failover to the read-only copy if the primary fails. Which Azure SQL Database feature should they enable?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Why wrong: Incorrect. Active geo-replication creates asynchronous replicas in a different region, not suitable for in-region synchronous read-only offload.
B
Auto-failover groups
Why wrong: Incorrect. Auto-failover groups manage failover of a group of databases across regions, not for in-region read-only replicas.
C
Read Scale-Out
Correct. Read Scale-Out provides a synchronous read-only replica in the same region, supporting reporting and automatic failover.
D
Database copy
Why wrong: Incorrect. Database copy creates a snapshot copy manually, which is not synchronous nor provides automatic failover.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Read Scale-Out
Read Scale-Out is the correct feature because it offloads reporting queries to a read-only replica that stays synchronously committed within the same Azure region. It also provides automated failover to the read-only replica if the primary database fails, meeting both the synchronous sync and failover requirements for Premium-tier Azure SQL Database.
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.
✗
Active geo-replication
Why it's wrong here
Incorrect. Active geo-replication creates asynchronous replicas in a different region, not suitable for in-region synchronous read-only offload.
✗
Auto-failover groups
Why it's wrong here
Incorrect. Auto-failover groups manage failover of a group of databases across regions, not for in-region read-only replicas.
✓
Read Scale-Out
Why this is correct
Correct. Read Scale-Out provides a synchronous read-only replica in the same region, supporting reporting and automatic failover.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Database copy
Why it's wrong here
Incorrect. Database copy creates a snapshot copy manually, which is not synchronous nor provides automatic failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse cross-region disaster recovery features (Active geo-replication and Auto-failover groups) with in-region high availability and read-scale capabilities, overlooking that Read Scale-Out is the only option that provides synchronous replication and automated failover within the same Azure region.
Detailed technical explanation
How to think about this question
Read Scale-Out leverages Always On availability groups under the hood, creating a readable secondary replica that uses synchronous commit to ensure zero data loss within the same region. The read-only connection string uses ApplicationIntent=ReadOnly to route queries automatically to the replica, while failover is handled by the Premium tier's built-in high availability, which promotes the secondary to primary within seconds. In a real-world scenario, this allows reporting workloads to run without impacting transactional performance, and the synchronous replication guarantees that reports see the most recent committed data.
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: Read Scale-Out — Read Scale-Out is the correct feature because it offloads reporting queries to a read-only replica that stays synchronously committed within the same Azure region. It also provides automated failover to the read-only replica if the primary database fails, meeting both the synchronous sync and failover requirements for Premium-tier Azure SQL Database.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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