Explanation
One of the most productive tools to use with Autonomous Database is SQL Developer, which is included for free with Autonomous Database. In this section, we show how to connect the Autonomous Database with SQL Developer. SQL developer fully supports connectivity to Autonomous Database and is Autonomous Database aware. To establish a connection to Autonomous Database, select the Connections green plus sign at the top left corner of the tool.
A new connection screen will appear, the same for an autonomous or non-autonomous database. In the top three lines, you will want to name the connection and fill in the appropriate username and password for the user you will be connecting to. Under Connection Type, the type to use for Autonomous Database is Cloud Wallet. When using this connection type, which is the only connection type supported for Autonomous Database, the location of the downloaded wallet must be specified in the configuration file entry.
Navigate to and select the downloaded wallet file. If the correct wallet file is selected, the service drop down will list all the services available to the Autonomous Database. Select the one that most appropriately provides the ser vice level your connection will require. Please refer to the section on user connections and services in another module for more information on this. Finally, to establish a connection, click Connect.
https://docs.oracle.com/en/cloud/paas/autonomous-data-warehouse-cloud/user/connect-sql-dev182.html#GUID-1