A service that migrates databases to AWS with minimal downtime, supporting homogeneous migrations (same engine) and heterogeneous ones (different engine, combined with the Schema Conversion Tool). It supports full-load and CDC (change data capture) to keep source and target in sync during the migration.
In SAP-C02 it's the key tool for the Replatform strategy: migrating from MySQL on EC2 to RDS with minimal downtime using DMS with CDC active until the final cutover. Question: migrate an Oracle database to Aurora PostgreSQL → DMS + Schema Conversion Tool.
AWS Database Migration Service (DMS) is a concept that can show up on the exam. Check the full guide to see it in context.