Currently the Testcomplete documentation is quite confusing and laborious . No detailed steps are provided. Testcomplete can has functiinality for the database testing but the examples provided are...
There are many databases available to choose from, and having documentation that covers all of these databases, with examples makes even more "laborious"!
TC documentation is very valuable, has the required information, plus snippets of coding, to get the individual started.
I've used Oracle 8/9 may years ago, and if you are familiar with Oracle DB, then you should know that you need Oracle ODBC driver to connect to Oracle DB via a connection string.
ADO Object has code snippet, using ODBC driver Microsoft.Jet.OLEDB.4.0, which connects to a Microsoft Access Database file.