- A
Verify that the application connection string includes 'ApplicationIntent=ReadOnly' for read-only queries.
Correct: Read scale-out requires the application to specify read-only intent; otherwise, connections go to the primary replica.
- B
Review the maintenance window schedule to see if the primary replica was being updated.
Why wrong: Incorrect: Maintenance windows do not change the read routing behavior.
- C
Check the 'ReadScale' property of the database to ensure it is set to 'Enabled'.
Why wrong: Incorrect: Read scale-out is automatically enabled for Business Critical tier; the property is not user-configurable.
- D
Confirm that the database is in a zone-redundant configuration by checking the 'ZoneRedundant' property.
Why wrong: Incorrect: Zone-redundancy provides high availability but does not affect read routing without the correct connection string.
Quick Answer
The answer is to verify that the application connection string includes `ApplicationIntent=ReadOnly` for read-only queries. This is correct because Azure SQL Database’s read-only routing depends entirely on the client signaling its intent at connection time; without this parameter, all traffic—including read-only workloads—is directed to the primary replica, bypassing any available readable secondary replicas. On the DP-300 exam, this concept tests your understanding of how connection strings control traffic flow in Business Critical or Premium tiers, and it often appears as a trick where candidates assume routing is automatic or that the server-side configuration alone handles it. A common trap is overlooking that the secondary replica is only used when the client explicitly declares read-only intent, so even with zone redundancy and proper maintenance events, latency spikes can occur if the application never sends the correct parameter. Remember the memory tip: “No intent, no redirect”—if the connection string lacks `ApplicationIntent=ReadOnly`, the primary replica handles everything.
DP-300 Plan and implement data platform resources Practice Question
This DP-300 practice question tests your understanding of plan and implement data platform resources. 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.
You manage an Azure SQL Database that uses a Business Critical tier with a zone-redundant configuration. During a planned maintenance event, you notice a significant increase in query latency. You suspect that the read-only intent routing is not working as expected. What should you check first to ensure read-only connections are using the secondary replica?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Verify that the application connection string includes 'ApplicationIntent=ReadOnly' for read-only queries.
Option A is correct because the read-only intent routing in Azure SQL Database relies on the client connection string including `ApplicationIntent=ReadOnly`. Without this parameter, all connections, including those intended for read-only workloads, will be directed to the primary replica, even if a readable secondary replica is available. This is the first and most fundamental check to ensure read-only queries are routed to the secondary.
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.
- ✓
Verify that the application connection string includes 'ApplicationIntent=ReadOnly' for read-only queries.
Why this is correct
Correct: Read scale-out requires the application to specify read-only intent; otherwise, connections go to the primary replica.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Review the maintenance window schedule to see if the primary replica was being updated.
Why it's wrong here
Incorrect: Maintenance windows do not change the read routing behavior.
- ✗
Check the 'ReadScale' property of the database to ensure it is set to 'Enabled'.
Why it's wrong here
Incorrect: Read scale-out is automatically enabled for Business Critical tier; the property is not user-configurable.
- ✗
Confirm that the database is in a zone-redundant configuration by checking the 'ZoneRedundant' property.
Why it's wrong here
Incorrect: Zone-redundancy provides high availability but does not affect read routing without the correct connection string.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the `ReadScale` property (which is only for Hyperscale) with the Business Critical tier's built-in read-only routing, or they may think that zone-redundancy or maintenance schedules directly control read-only routing, when in fact the connection string's `ApplicationIntent` is the sole determinant.
Detailed technical explanation
How to think about this question
Azure SQL Database Business Critical tier provides a readable secondary replica by default, but the routing decision is made at the gateway level based on the `ApplicationIntent` attribute in the TDS login packet. If the application does not set `ApplicationIntent=ReadOnly`, the gateway forwards the connection to the primary replica regardless of the secondary's availability. This behavior is defined in the TDS protocol and is independent of the zone-redundancy setting or the maintenance window.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DP-300 question test?
Plan and implement data platform resources — This question tests Plan and implement data platform resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify that the application connection string includes 'ApplicationIntent=ReadOnly' for read-only queries. — Option A is correct because the read-only intent routing in Azure SQL Database relies on the client connection string including `ApplicationIntent=ReadOnly`. Without this parameter, all connections, including those intended for read-only workloads, will be directed to the primary replica, even if a readable secondary replica is available. This is the first and most fundamental check to ensure read-only queries are routed to the secondary.
What should I do if I get this DP-300 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This DP-300 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 DP-300 exam.
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