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Migrating databases to Azure is a critical step for organisations moving to the cloud. The Azure Database Migration Service (DMS) is a fully managed service designed to enable seamless database migrations with minimal downtime. This lesson covers migration planning, DMS capabilities, supported scenarios, and best practices.
Manual database migration — exporting data, transferring files, importing to the target — is error-prone, time-consuming, and often requires extended downtime. DMS automates and simplifies this process:
| Benefit | Description |
|---|---|
| Minimal downtime | Online migrations keep the source database operational |
| Automated assessment | Identifies compatibility issues before migration |
| Managed service | No infrastructure to provision or manage |
| Multiple sources | Supports SQL Server, PostgreSQL, MySQL, MongoDB, Oracle |
| Multiple targets | Azure SQL Database, SQL Managed Instance, PostgreSQL, MySQL, Cosmos DB |
| Progress monitoring | Track migration status in the Azure Portal |
The source database is taken offline during migration:
Source DB (offline) → DMS → Target DB (Azure)
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