CV0-004 Deployment Practice Question
A company is migrating an on-premises MySQL database to Azure SQL Database using Azure Database Migration Service. They want minimal downtime. Which migration mode should they choose?
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
✓
Online migration with continuous sync
Azure DMS offers online migration mode that uses CDC to replicate ongoing changes, allowing near-zero downtime. Offline mode requires stopping writes during migration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bulk copy
Why it's wrong here
Bulk copy transfers table data in batches without continuous change replication, so inserts and updates made during the copy are missed and downtime extends across the load. It is tempting because it suits one-off data loads into an already-prepared target, which is correct when the schema is deployed and no live writes occur.
- ✗
Offline migration
Why it's wrong here
Offline migration copies data while the source database remains unavailable to applications, so writes during the cutover are lost and downtime spans the whole copy. It is tempting because it suits small databases or maintenance-window migrations, which is the correct choice when downtime tolerance is high.
- ✓
Online migration with continuous sync
Why this is correct
Online migration with continuous sync keeps the source MySQL database available whilst replicating ongoing changes to Azure SQL Database, then performs a brief cutover. This directly satisfies the minimal-downtime constraint, unlike offline migration, which requires the source to be taken offline for the entire data copy.
- ✗
Schema conversion only
Why it's wrong here
Schema conversion only translates MySQL schema objects to Azure SQL Database; it moves no row data, so the database is never migrated. It is tempting because assessment and schema translation precede every Azure Database Migration Service project, making it correct when only compatibility remediation is required, not the data cutover itself.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.