The answer is to migrate the data files to Premium SSD managed disks. This is the most cost-effective way to reduce I/O latency for SQL Server on Azure VMs because Premium SSDs deliver consistent, low-latency performance with significantly higher IOPS and throughput compared to Standard HDDs, directly resolving the intermittent performance degradation during peak hours without requiring a VM size change that would increase compute costs. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your understanding of Azure disk storage tiers and their impact on SQL Server workloads, often appearing as a trap where candidates might incorrectly choose to scale up the VM or add caching. The key insight is that storage performance is independent of VM size; you can upgrade disks while keeping the same compute allocation. Memory tip: think “SSD for speed, HDD for cheap—when latency hurts, swap the disk, not the VM.”
DP-300 Practice Question: Monitor, configure, and optimize database resources
This DP-300 practice question tests your understanding of monitor, configure, and optimize database resources. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 runs a critical SQL Server database on Azure Virtual Machines. The database experiences intermittent performance degradation during peak hours. The database administrator notices high I/O latency on the data drive. The current disk configuration uses Standard HDDs. What is the most cost-effective action to reduce I/O latency without changing the virtual machine size?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate the data files to Premium SSD managed disks.
Migrating the data files to Premium SSD managed disks is the most cost-effective action to reduce I/O latency without changing the virtual machine size. Premium SSDs provide consistent low-latency performance and higher IOPS/throughput compared to Standard HDDs, directly addressing the high I/O latency during peak hours. This change does not require resizing the VM, keeping compute costs unchanged while improving storage performance.
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 instant file initialization in SQL Server.
Why it's wrong here
Instant file initialization helps with file growth, not I/O latency.
✗
Increase the virtual machine size to a series with higher I/O limits.
Why it's wrong here
This may not directly address disk latency and increases cost.
✓
Migrate the data files to Premium SSD managed disks.
Why this is correct
Premium SSD provides lower latency and is cost-effective without changing VM size.
Related concept
Read the scenario before looking for a memorised answer.
✗
Migrate the data files to Standard SSD managed disks.
Why it's wrong here
Standard SSD still has higher latency than Premium SSD.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Standard SSD (Option D) thinking it is a sufficient upgrade, but they overlook that Premium SSD is required to achieve the low latency needed for critical databases, and that Standard SSD still uses HDD-like latency profiles under sustained load.
Detailed technical explanation
How to think about this question
Premium SSD managed disks use solid-state drives with single-digit millisecond latencies and provisioned IOPS/throughput that scale with disk size, unlike Standard HDDs which rely on spinning media with variable latency. In Azure, the VM's I/O limits are tied to the VM size, but Premium SSDs can deliver up to 20,000 IOPS per disk (depending on size) without changing the VM, whereas Standard HDDs max out at 500 IOPS per disk. A real-world scenario is a high-transaction OLTP database where queue depths spike during peak hours; Premium SSDs absorb the load with consistent sub-10ms latency, while Standard HDDs would cause query timeouts and blocking.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Migrate the data files to Premium SSD managed disks. — Migrating the data files to Premium SSD managed disks is the most cost-effective action to reduce I/O latency without changing the virtual machine size. Premium SSDs provide consistent low-latency performance and higher IOPS/throughput compared to Standard HDDs, directly addressing the high I/O latency during peak hours. This change does not require resizing the VM, keeping compute costs unchanged while improving storage performance.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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