The Azure SQL Migration extension in Azure Data Studio with online migration mode is the correct choice because it supports minimal-downtime migrations for large databases up to 10 TB while handling complex features like multiple filegroups and full-text indexing. This method leverages the Data Migration Service to continuously replicate ongoing changes from the source SQL Server to the target Azure SQL Database Hyperscale, enabling a near-seamless cutover with only a brief pause. On the Microsoft Azure Database Administrator Associate DP-300 exam, this scenario tests your understanding of migration strategies for enterprise-scale workloads, where offline methods like BACPAC or transactional replication would fail due to size or feature constraints. A common trap is choosing the offline Azure SQL Migration extension mode, which requires significant downtime for a 10-TB database. Remember the memory tip: “Online for ten, offline for ten minutes”—meaning online mode is essential when migrating 10 TB or more to Hyperscale to keep downtime to ten minutes or less.
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 a 10-TB SQL Server database to Azure SQL Database Hyperscale. The source database has multiple filegroups and uses full-text indexing. The migration must be completed with minimal downtime. Which migration method should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the Azure SQL Migration extension in Azure Data Studio with online migration mode
The Azure SQL Migration extension in Azure Data Studio with online migration mode is the correct choice because it supports minimal-downtime migrations for large databases (10 TB) with complex features like multiple filegroups and full-text indexing. It uses the Data Migration Service (DMS) to continuously replicate changes from the source to the target Azure SQL Database Hyperscale, allowing you to cut over with only a brief pause.
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 from on-premises to Azure
Why it's wrong here
Complex and may have limitations with full-text indexing.
✗
Use Azure Data Factory to copy data
Why it's wrong here
Not optimized for large database migrations and may not preserve all objects.
✓
Use the Azure SQL Migration extension in Azure Data Studio with online migration mode
Why this is correct
Supports online migration to Hyperscale with minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
✗
Export a BACPAC file and import it to Azure
Why it's wrong here
Too slow for 10 TB and causes downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose transactional replication (Option A) because it is associated with minimal downtime, but they overlook that it is not designed for one-time migrations of databases with full-text indexing and multiple filegroups, and it requires ongoing synchronization that is unnecessary for a migration cutover.
Detailed technical explanation
How to think about this question
The Azure SQL Migration extension leverages the Azure DMS online migration mode, which uses the Log Reader Agent to capture ongoing changes from the source transaction log and apply them to the target Hyperscale database. Hyperscale’s architecture decouples compute from storage, allowing rapid scaling during migration, and the extension handles the conversion of filegroups to the single-filegroup model of Hyperscale while preserving full-text indexes via a separate migration step. In real-world scenarios, this method can handle terabytes of data with downtime measured in minutes, whereas offline methods would require hours or days.
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: Use the Azure SQL Migration extension in Azure Data Studio with online migration mode — The Azure SQL Migration extension in Azure Data Studio with online migration mode is the correct choice because it supports minimal-downtime migrations for large databases (10 TB) with complex features like multiple filegroups and full-text indexing. It uses the Data Migration Service (DMS) to continuously replicate changes from the source to the target Azure SQL Database Hyperscale, allowing you to cut over with only a brief pause.
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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