As the title of this post indicates, the Database Migration Service (DMS) could experiment with problems in very rare cases with the capacity to start/create a service due to not having enough resources in a specific region. It is interesting to start explaining why the provisioned number of Virtual Machines (VM) could impact DMS. If we ask Why? The answer is simple: behind the scenes, the VMs represent the “workers” in charge of executing ALL the tasks required by the migration service of DMS.