DP-300 Plan and implement data platform resources Practice Question
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?
⚠ Common exam trap
Many candidates 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.
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.
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.
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.
- ✗
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.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Transparent Data Encryption
Transparent Data Encryption is a security feature that automatically encrypts data written to a database and decrypts it when read, without requiring any changes to the application.
Key term
Azure SQL Authentication
Azure SQL Authentication is the process of verifying a user's identity to access an Azure SQL database using either a username and password (SQL Authentication) or a Microsoft Entra ID (formerly Azure AD) identity.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.