Do you see any sort of error message?
I guess you already try installing the driver from tableau site based on your Tableau Desktop Version and Operating System.
A few things to try:
1) Can you connect to Oracle, from your computer, using an Oracle tool such as SQL Developer?
2) Can you connect to Oracle using ODBC?
3) If you can connect via ODBC, can you try using the ODBC connection you set up in # 2 to connect in Tableau (instead of using the built-in Oracle connector).
Also, what errors are you getting? Does it just freeze? Does it give some specific error message?
Hello Everyone! Thank you so much for all your replies. I am able to get my connection back after reinstalling the driver (I think the driver may have been corrupted...)
Appreciate for all your help!