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Showing content from https://learn.microsoft.com/en-us/azure/dms/tutorial-sql-server-to-managed-instance below:

What is Azure Database Migration Service?

Azure Database Migration Service is a fully managed service designed to enable seamless migrations from multiple database sources to Azure data platforms with minimal downtime (online migrations).

With Azure Database Migration Service currently we offer two versions:

Database Migration Service - via Azure SQL Migration extension for Azure Data Studio, Azure portal, PowerShell and Azure CLI.
Database Migration Service (classic) - via Azure portal, PowerShell and Azure CLI.

Database Migration Service powers the "Azure SQL Migration" extension for Azure Data Studio, and provides more features. Azure portal, PowerShell and Azure CLI can also be used to access DMS. Currently, it supports SQL Database modernization to Azure. For improved functionality and supportability, consider migrating to Azure SQL Database by using the DMS.

Note

Azure DMS provides migration tracking in Azure at no additional cost to users. Specify a SQL Server instance name to create a migration resource visible in the Azure portal to help with future migrations using the same source.

Database Migration Service (classic) via Azure portal, PowerShell and Azure CLI is an older version of the Azure Database Migration Service. It offers database modernization to Azure and support scenarios like â SQL Server, PostgreSQL, MySQL, and MongoDB.

Migrate databases with Azure SQL Migration extension for Azure Data Studio

The Azure SQL Migration extension for Azure Data Studio brings together a simplified assessment, recommendation, and migration experience that delivers the following capabilities:

A responsive user interface that provides you with an end-to-end migration experience that starts with a migration readiness assessment, and SKU recommendation (based on performance data), and finalizes with the actual migration to Azure SQL.
An enhanced assessment mechanism that can evaluate SQL Server instances, identifying databases that are ready for migration to the different Azure SQL targets.
An SKU recommendations engine (Preview) that collects performance data from the source SQL Server instance on-premises, generating right-sized SKU recommendations based on your Azure SQL target.
A reliable Azure service powered by Azure Database Migration Service that orchestrates data movement activities to deliver a seamless migration experience.
The ability to run online (for migrations requiring minimal downtime) or offline (for migrations where downtime persists through the migration) migration modes to suit your business requirements.
The flexibility to create and configure a self-hosted integration runtime to provide your own compute for accessing the source SQL Server and backups in your on-premises environment.
Provides a secure and improved user experience for migrating TDE databases and SQL/Windows logins to Azure SQL.

Check the following step-by-step tutorials for more information about each specific migration scenario by Azure SQL target:

Migration scenario Migration mode SQL Server to Azure SQL Managed Instance Online / Offline SQL Server to SQL Server on Azure Virtual Machine Online / Offline SQL Server to Azure SQL Database Offline

To learn more, see Migrate databases by using the Azure SQL Migration extension for Azure Data Studio.

Compare versions

Newer version of the Azure Database Migration Service is available as an extension for Azure Data Studio and can be accesses from Azure portal, which improved the functionality, user experience and supportability of the migration service. Consider using the Azure SQL Migration extension for Azure Data Studio and DMS Azure portal whenever possible.

The following table compares the functionality of the versions of the Database Migration Service:

Feature DMS (classic) DMS (Azure SQL extension for ADS) DMS (Azure portal) Notes Assessment No Yes No Assess compatibility of the source. SKU recommendation No Yes No SKU recommendations for the target based on the assessment of the source. Azure SQL Database - Offline migration Yes Yes Yes Migrate to Azure SQL Database offline. Azure SQL Managed Instance - Online migration Yes Yes Yes Migrate to Azure SQL Managed Instance online with minimal downtime. Azure SQL Managed Instance - Offline migration Yes Yes Yes Migrate to Azure SQL Managed Instance offline. SQL Server on Azure SQL VM - Online migration No Yes Yes Migrate to SQL Server on Azure VMs online with minimal downtime. SQL Server on Azure SQL VM - Offline migration Yes Yes Yes Migrate to SQL Server on Azure VMs offline. Migrate logins Yes Yes No Migrate logins from your source to your target. Migrate schemas Yes No Yes Migrate schemas from your source to your target. Azure portal support Yes Partial Yes Create and Monitor your migration by using the Azure portal. Integration with Azure Data Studio No Yes No Migration support integrated with Azure Data Studio. Regional availability Yes Yes Yes More regions are available with the extension. Improved user experience No Yes Yes The DMS is faster, more secure, and easier to troubleshoot. Automation Yes Yes Yes The DMS supports PowerShell and Azure CLI. Private endpoints No Yes Yes Connect to your source and target using private endpoints. TDE support No Yes No Migrate databases encrypted with TDE.

Azure Database Migration Service integrates some of the functionality of our existing tools and services. It provides customers with a comprehensive, highly available solution. The service uses the Data Migration Assistant to generate assessment reports that provide recommendations to guide you through the required changes before a migration. It's up to you to perform any remediation required. Azure Database Migration Service performs all the required steps when ready to begin the migration process. Knowing that the process takes advantage of Microsoft's best practices, you can fire and forget your migration projects with peace of mind.

Regional availability

For up-to-date info about the regional availability of Azure Database Migration Service, see Products available by region.

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