What file needs to be modified to enable HTTP proxy connections for OAC to ADB?

To enable HTTP proxy connections for Oracle Analytics Cloud (OAC) to Oracle Autonomous Database (ADB), the correct file to modify is sqlnet.ora. This file contains various configuration parameters that govern how client applications connect to the database, including settings that can facilitate the use of a proxy.

By modifying sqlnet.ora, properties related to connection handling and proxy configurations can be set, ensuring that the database connections utilize the specified HTTP proxy settings. This is particularly important in environments where direct access to the database may be restricted, necessitating the use of a proxy for secure communication.

Other files listed serve different purposes. jdbc.properties pertains to JDBC connection properties but is not specifically used for configuring a proxy connection. tnsnames.ora is primarily used for specifying database connection details, but it does not manage proxy settings. Lastly, proxysettings.conf is not a standard Oracle configuration file typically used for setting up connections to ADB. Thus, sqlnet.ora is the appropriate choice for enabling and configuring HTTP proxy connections effectively.