You can manage on-premises databases in the Database Autonomy Service (DAS) console. You can use one of the following methods to connect on-premises databases to DAS.

Method Description
Express Connect Express Connect is the abstraction of the network connection between Alibaba Cloud access points and on-premises data centers. You can migrate on-premises databases to the cloud by applying for an exclusive physical connection from a service provider, using a shared physical connection from Alibaba Cloud partners, or using Alibaba Cloud managed products. Express Connect enables the internal networks to be connected without using the Internet. Therefore, compared with traditional Internet connections, Express Connect provides higher security, reliability, and speed as well as lower network latency. For more information, go to the Express Connect product page.
VPN Gateway VPN Gateway securely and reliably connects on-premises data centers to Alibaba Cloud VPCs over encrypted channels. For more information, go to the VPN Gateway product page.
Internet When on-premises data centers are connected to Alibaba Cloud over the Internet, DAS encrypts the data access links so that you do not need to worry about data security.