The answer is to use Azure Database Migration Service with online migration mode. This approach is correct because it leverages transactional log shipping to continuously synchronize changes from the source SQL Server to Azure SQL Managed Instance, allowing the source database to remain fully operational throughout the migration process. For a 500 GB database with a high transaction rate, this near-zero downtime method is essential, as it only requires a brief final cutover to switch applications to the target. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your understanding of migration modes under the "Migrate databases to Azure" domain, where the common trap is choosing an offline method like backup and restore, which would cause significant downtime for large, active databases. Remember the key distinction: online mode uses log shipping for continuous sync, while offline mode requires the source to be taken down. A helpful memory tip is "Online = Logs keep rolling, Offline = Database goes cold."
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 planning the migration of a large on-premises SQL Server database to Azure SQL Managed Instance. The database is 500 GB in size and has a high transaction rate. You need to minimize downtime during the migration. Which migration approach should you recommend?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Azure Database Migration Service with online migration mode.
Option D is correct because Azure Database Migration Service (DMS) with online migration mode uses transactional log shipping to continuously synchronize changes from the source SQL Server to Azure SQL Managed Instance, enabling near-zero downtime. This is essential for a 500 GB database with a high transaction rate, as it allows the source to remain operational during the migration and only requires a final cutover with minimal interruption.
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.
✗
Set up transactional replication to replicate data to SQL Managed Instance.
Why it's wrong here
Replication requires schema changes and is complex.
✗
Perform an offline migration using Azure Database Migration Service.
Why it's wrong here
Offline migration requires downtime.
✗
Export the database as a BACPAC file and import to SQL Managed Instance.
Why it's wrong here
BACPAC is offline and slow for large databases.
✓
Use Azure Database Migration Service with online migration mode.
Why this is correct
Online mode uses log shipping to minimize downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'online migration' with 'replication' (Option A), assuming transactional replication is the only way to achieve minimal downtime, but DMS online mode is the native, integrated service designed specifically for this scenario with simpler management and lower overhead.
Detailed technical explanation
How to think about this question
Azure DMS online migration leverages the native SQL Server backup and log shipping mechanism: it takes a full backup, restores it to the target, and then continuously streams transaction log backups from the source to the target, applying them in near real-time. During the final cutover, the source database is set to read-only, the last log backup is applied, and the target is activated, typically causing only seconds of downtime. This approach is ideal for large databases with high transaction rates because it avoids the performance impact of a full data export and allows the source to remain fully operational until the cutover.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Use Azure Database Migration Service with online migration mode. — Option D is correct because Azure Database Migration Service (DMS) with online migration mode uses transactional log shipping to continuously synchronize changes from the source SQL Server to Azure SQL Managed Instance, enabling near-zero downtime. This is essential for a 500 GB database with a high transaction rate, as it allows the source to remain operational during the migration and only requires a final cutover with minimal interruption.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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