Create a database schema in Oracle with the appropriate permissions; name it jwdb (or another preferred name) e.g.
Download jwdb-oracle-ddl.sql and load this SQL file to "jwdb" schema. This will populate all necessary Joget table structures into "jwdb".
In joget-installation-directory/wflow/, create a new datasource profile file - app_datasource-oracle.properties.
Open to edit joget-installation-directory/wflow/app_datasource-oracle.properties in text editor, then insert contents as shown in Figure 1 below. You may need to edit the configurations (such as datasource URL, database user/password) according to your environment.
Open to edit joget-installation-directory/wflow/app_datasource.properties in text editor, and change the content as shown in Figure 2 below. This is to activate the datasource profile named "oracle".
Restart Joget server.
Figure 1: Datasource Profile Configurations
You may need to change the datasource URL, database user and database user's password accordingly.