DP-300 Plan and implement data platform resources Practice Question
You are the database administrator for a large e-commerce company. The company has a SQL Server 2019 Enterprise Edition instance running on-premises with multiple databases. One of the databases, 'OrdersDB', is 2 TB in size and has a high transaction rate. The company plans to migrate 'OrdersDB' to Azure SQL Managed Instance to reduce operational overhead. The migration must have minimal downtime, and the target service tier must be Business Critical with 16 vCores. You have set up a test environment and performed a successful test migration using the Azure Database Migration Service (DMS) with online mode. During the final migration, the network bandwidth between on-premises and Azure is limited to 100 Mbps. The migration is taking longer than expected, and you are concerned about the log backup growth. What should you do to minimize the risk of the migration failing due to log space exhaustion?
⚠ Common exam trap
Test-takers frequently think offline migration is the only way to avoid log growth, but the question explicitly requires minimal downtime, making online mode mandatory, and the correct solution is to manage the log backup frequency rather than changing the migration mode or bandwidth.
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
✓
Increase the frequency of transaction log backups on the source database to keep the log small.
Increasing the frequency of transaction log backups on the source database reduces the size of the active log, preventing log space exhaustion during the long-running online migration. The Azure Database Migration Service (DMS) in online mode continuously captures and applies log changes, so a smaller log reduces the risk of the log file filling up before backups can be taken, especially under constrained network bandwidth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to offline migration mode to avoid log growth issues.
Why it's wrong here
Offline migration requires downtime and may not meet the minimal downtime requirement.
- ✗
Pause the migration and request a higher network bandwidth from the ISP.
Why it's wrong here
This may cause delays and is not under your control.
- ✗
Reduce the Azure SQL Managed Instance storage performance tier to standard to reduce cost.
Why it's wrong here
Storage tier does not affect log backup growth on the source.
- ✓
Increase the frequency of transaction log backups on the source database to keep the log small.
Why this is correct
Frequent log backups prevent log file from growing too large during migration.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Managed Instance
Azure SQL Managed Instance is a fully managed cloud database service that gives you nearly all the features of Microsoft SQL Server on your own server, without you having to manage the hardware or operating system.
Key term
Azure Database Migration
Azure Database Migration is the process of moving databases from on-premises servers or other cloud platforms to Azure’s cloud database services with minimal downtime and data loss.
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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.