- A
Use Azure Database Migration Service offline migration with automatic cutover.
Why wrong: Offline migration requires downtime for the entire data copy, likely exceeding 4 hours.
- B
Deploy a new Managed Instance, configure TDE with customer-managed keys, and use transactional replication to synchronize data.
Why wrong: Replication setup is complex and may not fit the 4-hour window.
- C
Use Azure Database Migration Service online migration, configure Managed Instance with customer-managed TDE, and enable Entra ID authentication.
Online migration minimizes downtime, and Managed Instance supports all required features.
- D
Use Azure backup to URL and restore to Managed Instance, then configure TDE with customer-managed keys.
Why wrong: Backup/restore may take longer than 4 hours and does not minimize downtime.
Quick Answer
The answer is to use Azure Database Migration Service online migration with a Managed Instance configured for customer-managed TDE and Microsoft Entra ID authentication. This is correct because DMS online mode supports continuous data synchronization for large, multi-database workloads like your 1.5 TB, 50-database environment, preserving transactional consistency for cross-database queries and Service Broker during the migration, with a final cutover that fits within a 4-hour downtime window. On the DP-300 exam, this scenario tests your ability to distinguish between offline and online migration methods for mission-critical systems, with a common trap being to choose offline migration for simplicity—but that would exceed the downtime limit for a database of this size. The key is remembering that customer-managed TDE requires configuring the key in Azure Key Vault before migration, and Entra ID authentication must be enabled on the target instance as a separate step. Memory tip: “Online DMS, Key Vault keys, Entra ID please—cutover in under four with ease.”
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. 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.
Your company is migrating a mission-critical application from SQL Server 2019 on-premises to Azure SQL Managed Instance. The database is 1.5 TB and has 50 databases that need to be migrated. The application uses SQL Server Agent jobs, Service Broker, and cross-database queries. The security requirements mandate that the migration must use Microsoft Entra ID authentication, and all data must be encrypted at rest using customer-managed keys in Azure Key Vault. The migration window is limited to 4 hours of downtime. You need to choose the migration method and configure the target environment. What should you do?
Answer choices
Why each option matters
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 online migration, configure Managed Instance with customer-managed TDE, and enable Entra ID authentication.
Option C is correct because Azure Database Migration Service (DMS) online migration supports minimal downtime for large databases (1.5 TB) and 50 databases, while maintaining transactional consistency for cross-database queries and Service Broker. Configuring the Managed Instance with customer-managed TDE (Transparent Data Encryption) using Azure Key Vault meets the encryption-at-rest requirement, and enabling Microsoft Entra ID authentication satisfies the security mandate. The online migration mode allows continuous synchronization during the migration window, with a final cutover within the 4-hour downtime limit.
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.
- ✗
Use Azure Database Migration Service offline migration with automatic cutover.
Why it's wrong here
Offline migration requires downtime for the entire data copy, likely exceeding 4 hours.
- ✗
Deploy a new Managed Instance, configure TDE with customer-managed keys, and use transactional replication to synchronize data.
Why it's wrong here
Replication setup is complex and may not fit the 4-hour window.
- ✓
Use Azure Database Migration Service online migration, configure Managed Instance with customer-managed TDE, and enable Entra ID authentication.
Why this is correct
Online migration minimizes downtime, and Managed Instance supports all required features.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Azure backup to URL and restore to Managed Instance, then configure TDE with customer-managed keys.
Why it's wrong here
Backup/restore may take longer than 4 hours and does not minimize downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume offline migration (Option A or D) is acceptable for large databases, but the 4-hour downtime window makes online migration (Option C) the only viable choice, and they may overlook that transactional replication (Option B) cannot handle cross-database dependencies and Service Broker messages during migration.
Detailed technical explanation
How to think about this question
Azure DMS online migration uses the Log Reader Agent to capture and apply ongoing changes from the source SQL Server transaction log, enabling near-zero downtime for large databases. For Managed Instance, customer-managed TDE uses Azure Key Vault as the key store, where the database encryption key (DEK) is protected by an asymmetric key stored in the vault, requiring the Managed Instance to have appropriate permissions (via Azure AD application or managed identity) to access the key. Entra ID authentication must be enabled on the Managed Instance after deployment, and during online migration, the source and target must be configured for the same authentication mode to avoid login failures.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Questions learners often ask
What does this DP-300 question test?
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 online migration, configure Managed Instance with customer-managed TDE, and enable Entra ID authentication. — Option C is correct because Azure Database Migration Service (DMS) online migration supports minimal downtime for large databases (1.5 TB) and 50 databases, while maintaining transactional consistency for cross-database queries and Service Broker. Configuring the Managed Instance with customer-managed TDE (Transparent Data Encryption) using Azure Key Vault meets the encryption-at-rest requirement, and enabling Microsoft Entra ID authentication satisfies the security mandate. The online migration mode allows continuous synchronization during the migration window, with a final cutover within the 4-hour downtime limit.
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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Last reviewed: Jun 24, 2026
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.
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