The answer is Azure Database Migration Service with online migration mode. This is the correct choice because online migration mode enables continuous data synchronization between your on-premises SQL Server and Azure SQL Database during the initial bulk copy of the 5 TB dataset, allowing ongoing changes to replicate in near real-time and reducing the final cutover to a brief pause rather than hours of downtime. On the DP-300 exam, this scenario tests your understanding of migration strategies for large-scale databases where minimizing disruption is critical; a common trap is selecting offline migration or self-managed tools like backup and restore, which would cause extended unavailability for a 5 TB database. Remember the key distinction: online mode equals minimal downtime, offline mode equals full downtime. A helpful memory tip is to think of "DMS Online" as "Data Moves Seamlessly" — the service handles the heavy lifting while your application stays live.
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 migrating an on-premises SQL Server database with 5 TB of data to Azure SQL Database. The database has multiple large tables and indexes. You need to minimize downtime during migration. Which service should you use?
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
✓
Azure Database Migration Service with online migration mode
Azure Database Migration Service (DMS) with online migration mode is the correct choice because it minimizes downtime by continuously synchronizing ongoing changes from the on-premises SQL Server to Azure SQL Database while the initial bulk data copy is in progress. This allows you to cut over to the target with only a brief pause, which is critical for a 5 TB database where offline methods would cause extended unavailability.
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.
✗
Export to BACPAC and import using SqlPackage
Why it's wrong here
BACPAC can cause long downtime for large databases.
✓
Azure Database Migration Service with online migration mode
Why this is correct
DMS online mode minimizes downtime by continuously replicating changes.
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.
✗
Backup and restore using URL with log shipping
Why it's wrong here
Log shipping is not supported for Azure SQL Database.
✗
Transactional replication from on-premises to Azure SQL Database
Why it's wrong here
Replication setup is complex and not optimal for large databases.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure SQL Database with SQL Server on Azure VMs, assuming that native backup/restore or log shipping (Option C) is available for Azure SQL Database, when in fact those features are only supported for IaaS-based SQL Server instances.
Detailed technical explanation
How to think about this question
Azure DMS online migration uses the Change Data Capture (CDC) feature on the source SQL Server to track ongoing DML changes while the initial snapshot is transferred via bulk copy (BCP). After the snapshot is applied, the service continuously applies the captured changes to the target, and during the cutover, it applies any final pending changes and then switches the application connection to Azure SQL Database, typically resulting in only seconds of downtime. A real-world scenario where this matters is migrating a large e-commerce database during a holiday season, where even minutes of downtime can cause significant revenue loss.
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: Azure Database Migration Service with online migration mode — Azure Database Migration Service (DMS) with online migration mode is the correct choice because it minimizes downtime by continuously synchronizing ongoing changes from the on-premises SQL Server to Azure SQL Database while the initial bulk data copy is in progress. This allows you to cut over to the target with only a brief pause, which is critical for a 5 TB database where offline methods would cause extended unavailability.
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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Question Discussion
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