What is a drawback of using the Azure Data Migration Service?

The assertion that the Azure Data Migration Service cannot be used in all scenarios highlights a significant limitation of this tool. While the service is robust and can facilitate the migration of databases to Azure, there are specific circumstances and conditions where it may not be applicable. For instance, it might not effectively handle migrations involving certain versions and configurations of source databases, or it could be unsuitable for complex database environments that have unique requirements, such as those involving interdependencies between multiple databases or stringent compliance needs.

In cases where database structures are highly customized or when there are non-standard data types that need migration, alternative methods may need to be considered. This limitation emphasizes the necessity for database administrators to assess their specific migration needs and environment before deciding on using the Azure Data Migration Service, ensuring that it aligns with their migration requirements.

The other options, while they touch on potential considerations, do not encapsulate a broader limitation regarding scenarios where the service is not applicable, which is crucial for planning an effective database migration strategy.