The answer is to enable read scale-out and configure the application to use read-only intent. This feature allows Azure SQL Database to offload read-only queries to a secondary replica, which is critical for reducing load on the primary during high read throughput scenarios like an e-commerce product catalog. By setting `ApplicationIntent=ReadOnly` in the connection string, Entity Framework Core directs read-only operations to the secondary replica, while write operations continue to hit the primary. On the DP-300 exam, this tests your understanding of high-availability read scaling and connection string routing, often appearing as a trap where candidates confuse read scale-out with geo-replication or failover groups. A common memory tip: think of the connection string as a GPS—set the intent to “ReadOnly” to route traffic to the secondary, just like telling a navigation app you only want the scenic route.
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. 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.
You are configuring Azure SQL Database for a new e-commerce application that must support high read throughput for product catalog queries. The application uses Entity Framework Core and requires that read-only queries be offloaded to a secondary replica to reduce load on the primary. Which feature should you 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable read scale-out and configure the application to use read-only intent.
Read scale-out in Azure SQL Database allows you to offload read-only workloads to a readable secondary replica by setting the application connection string's `ApplicationIntent=ReadOnly`. This reduces load on the primary replica, which is essential for high read throughput in an e-commerce catalog scenario. Entity Framework Core can use this by specifying `ReadOnly` in the connection string or via a custom interceptor.
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.
✓
Enable read scale-out and configure the application to use read-only intent.
Why this is correct
Read scale-out uses a secondary replica for read-only queries.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Query Performance Insights and create indexes for frequent queries.
Why it's wrong here
This improves performance but does not offload reads.
✗
Configure Active Geo-Replication with a readable secondary in a different region.
Why it's wrong here
Geo-replication is for disaster recovery, not for offloading reads in the same region.
✗
Enable automatic tuning to force parameterization of queries.
Why it's wrong here
Automatic tuning does not offload read traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read scale-out with Active Geo-Replication, assuming that any readable secondary must be in a different region, but read scale-out works within the same region and is specifically designed for read-only workload offloading.
Detailed technical explanation
How to think about this question
Read scale-out leverages the Always On availability group technology built into Azure SQL Database, where the secondary replica is kept transactionally consistent using the same data and log files. The `ApplicationIntent=ReadOnly` attribute in the connection string signals the gateway to route the connection to the secondary replica, which uses snapshot isolation to avoid blocking on the primary. In a real-world scenario, if the application mixes read-write and read-only commands in the same transaction, the read-only intent will be ignored and the query will execute on the primary.
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 DP-300 question in full detail.
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: Enable read scale-out and configure the application to use read-only intent. — Read scale-out in Azure SQL Database allows you to offload read-only workloads to a readable secondary replica by setting the application connection string's `ApplicationIntent=ReadOnly`. This reduces load on the primary replica, which is essential for high read throughput in an e-commerce catalog scenario. Entity Framework Core can use this by specifying `ReadOnly` in the connection string or via a custom interceptor.
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: "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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