Quick Answer
The answer is to migrate to the vCore model with the Hyperscale service tier. This is correct because PAGELATCH_IO waits in Azure SQL Database General Purpose are caused by I/O contention on the shared tempdb and page file system, a bottleneck inherent to the DTU-based architecture where compute and storage are tightly coupled. Hyperscale eliminates this by separating compute from storage, using a local SSD buffer pool extension and a log service that dramatically reduces latch contention on I/O pages, directly resolving the high PAGELATCH_IO waits during peak loads. On the DP-300 exam, this scenario tests your understanding of service tier architecture limits versus scalability features; a common trap is assuming more DTUs (like scaling to S4) will fix I/O waits, but that only adds CPU/DTO capacity without addressing the underlying storage bottleneck. Remember the mnemonic: “DTU hits the wall, Hyperscale breaks the stall” — when PAGELATCH_IO spikes with 100% DTU, think tier, not size.
This DP-300 practice question tests your understanding of monitor, configure, and optimize database 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 are a database administrator for a medium-sized e-commerce company. The company runs its online transaction processing (OLTP) workload on an Azure SQL Database in the General Purpose service tier (DTU-based, S3). The database is used for order processing, inventory management, and customer data. Recently, during peak shopping hours (10 AM to 2 PM), users have reported that order entry forms take several seconds to submit, and inventory queries are timing out. Monitoring shows that DTU usage regularly hits 100% during these hours, with high PAGELATCH_IO waits. You need to resolve the performance issue with minimal cost increase. What should you do?
Increase the max storage size to 1 TB
Why wrong: Storage size does not affect DTU.
Increase the service tier to S4 during peak hours
Why wrong: Temporarily increases DTU but not architectural fix.
Create a read-only replica and offload reporting queries
Why wrong: Does not reduce DTU usage from writes.
Migrate to the vCore model with Hyperscale service tier
Hyperscale eliminates resource contention and handles high concurrency.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Migrate to the vCore model with Hyperscale service tier
Option B is correct because switching to the vCore model with Hyperscale tier provides better scalability and eliminates resource contention by separating compute and storage, reducing PAGELATCH_IO waits. Option A is wrong because scaling to S4 only adds more DTU but does not address the architecture limitation causing PAGELATCH_IO. Option C is wrong because adding a read-only replica does not help write-heavy OLTP. Option D is wrong because increasing storage does not affect DTU limits.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Increase the max storage size to 1 TB
Why it's wrong here
Storage size does not affect DTU.
Increase the service tier to S4 during peak hours
Why it's wrong here
Temporarily increases DTU but not architectural fix.
Create a read-only replica and offload reporting queries
Why it's wrong here
Does not reduce DTU usage from writes.
Migrate to the vCore model with Hyperscale service tier
Why this is correct
Hyperscale eliminates resource contention and handles high concurrency.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
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FAQ
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Static NAT maps one inside address to one outside address..
The correct answer is: Migrate to the vCore model with Hyperscale service tier — Option B is correct because switching to the vCore model with Hyperscale tier provides better scalability and eliminates resource contention by separating compute and storage, reducing PAGELATCH_IO waits. Option A is wrong because scaling to S4 only adds more DTU but does not address the architecture limitation causing PAGELATCH_IO. Option C is wrong because adding a read-only replica does not help write-heavy OLTP. Option D is wrong because increasing storage does not affect DTU limits.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-300 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 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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