I am trying to connect to an Oracle 18c database with an Oracle 18c Oracle Client in ArcCatalog 10.6.1. When I create a new SDE connection where I supply the Instance as the name of the database in the tnsnames.ora file, ArcCatalog automatically inserts sde:oracle11g: in front of the instance that I typed in. The SDE connection works, but I am confused why ArcCatalog would populate the Instance with oracle11g if the computer only has the Oracle 18c client installed on it. Here is the screenshot when I only supplied sded.
Can anyone also provide screenshots of what their SDE connections look like when connecting to an Oracle 18c database using an Oracle 18 client?