The answer is to upgrade the DMS instance to a Premium SKU to increase performance. This is correct because the bottleneck in a slow online migration for large databases is often the DMS instance’s own compute and I/O capacity, not the network bandwidth—500 Mbps is sufficient to move 2 TB within 48 hours, but the service’s ability to process change data capture and perform bulk inserts is limited by its underlying SKU. On the DP-300 exam, this scenario tests your understanding of how DMS tiers directly impact throughput during high-volume transactional migrations, with a common trap being to mistakenly focus on scaling the target Managed Instance or network. Remember the memory tip: “Premium processes faster—don’t blame the pipe when the pump is slow.”
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 the DBA for a financial services company. The company is migrating its on-premises SQL Server databases to Azure SQL Managed Instance. One of the databases is 2 TB in size and has a high transaction volume. The migration must have minimal downtime. The source environment is SQL Server 2019 running on Windows Server. The target is a General Purpose managed instance in the same region. The network bandwidth between on-premises and Azure is 500 Mbps. The DBA plans to use Azure Database Migration Service (DMS) for an online migration. However, during the initial sync, the migration is progressing slowly and the estimated time to completion is 48 hours. The DBA needs to reduce the migration time. What should the DBA do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade the DMS instance to a Premium SKU to increase performance
Upgrading the DMS instance to a Premium SKU increases the underlying compute and I/O resources allocated to the migration service, which directly improves the throughput of data movement during the online migration. Since the bottleneck is the DMS processing speed rather than network bandwidth (500 Mbps is sufficient for 2 TB over 48 hours), a Premium SKU provides higher performance tiers that can process change data capture (CDC) and bulk inserts faster, reducing the overall sync time.
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.
✗
Switch to an offline migration using BACPAC export and import
Why it's wrong here
Offline migration would cause downtime, which is not acceptable.
✓
Upgrade the DMS instance to a Premium SKU to increase performance
Why this is correct
Premium SKU provides more CPU and memory for data movement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Request a higher bandwidth connection from the network team
Why it's wrong here
Network bandwidth is a constraint but not the only factor; DMS performance also matters.
✗
Change the target to a different Azure region that is closer to the source
Why it's wrong here
Changing region may not be feasible and could increase latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume network bandwidth is the primary bottleneck and request a faster connection, but DMS performance is more commonly limited by its own SKU tier and the processing overhead of CDC, not the network pipe.
Detailed technical explanation
How to think about this question
Azure Database Migration Service uses a log-based CDC mechanism to capture changes from the source SQL Server transaction log and apply them to the target managed instance. The Premium SKU provides dedicated compute and storage resources with higher IOPS and memory, which accelerates log reading, data transformation, and bulk insertion into the target. In real-world scenarios, the DMS instance size is often overlooked, but it directly impacts the rate at which change data can be processed, especially under high transaction loads.
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 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: Upgrade the DMS instance to a Premium SKU to increase performance — Upgrading the DMS instance to a Premium SKU increases the underlying compute and I/O resources allocated to the migration service, which directly improves the throughput of data movement during the online migration. Since the bottleneck is the DMS processing speed rather than network bandwidth (500 Mbps is sufficient for 2 TB over 48 hours), a Premium SKU provides higher performance tiers that can process change data capture (CDC) and bulk inserts faster, reducing the overall sync time.
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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