Autonomous Database provides a number of different connection and networking options and features for connecting to a database.

• Using ACLs, VCNs, and Private Endpoints with Autonomous Database
  Describes the options for restricting network access to your Autonomous Database by specifying access control rules or using a virtual cloud network (private access with a private endpoint).
• Connect with Oracle Cloud Infrastructure FastConnect
  Oracle Cloud Infrastructure FastConnect provides an easy way for you to connect your on-premises network to Autonomous Database using FastConnect Public Peering. FastConnect provides higher-bandwidth options, and a more reliable and consistent networking experience compared to internet-based connections.
• Access Autonomous Database with VCN Transit Routing
  Oracle Cloud Infrastructure supports private access from your on-premises network to a database with virtual cloud network (VCN) Transit Routing.
• Access Autonomous Database with Service Gateway
  Autonomous Database supports private access from Oracle Cloud Infrastructure resources in a VCN through a service gateway.
• Use Database Resident Connection Pooling with Autonomous Database
  Database Resident Connection Pool (DRCP) in Autonomous Database supports easier and more efficient management of open connections. Using DRCP provides you with access to a connection pool in your database that enables a significant reduction in key database resources required to support many client connections and when the database needs to scale for many simultaneous connections.
• Use TCP Fast Open (TFO) to Connect Clients to Autonomous Database
  If your application is sensitive to network latency and you want to decrease the network latency between your application and the database, you can enable TCP Fast Open (TFO).
• Best Practices for Low Latency Connections with Autonomous Database
  Taking steps to reduce the latency for connections between an application and Autonomous Database is critical if your application performs many round-trips between the application and the database.
• View Network Information on the OCI Console
  On the Oracle Cloud Infrastructure Console you can view the network information for your Autonomous Database.