I have a flask app running on Apache server using mod_wsgi. Everything works fine until I try to access the database using cx_Oracle. At that moment I get the following error:

sqlalchemy.exc.DatabaseError: (cx_Oracle.DatabaseError) DPI-1047: Cannot locate a 64-bit Oracle Client library: "The specified module could not be found". See https://oracle.github.io/odpi/doc/installation.html#windows for help.

I have added the client library path to the os environment variables. It works well if I start the application from Pycharm IDE.

I have even added the following line in my .wsgi file.

sys.path.append('D:\FlaskDev\instantclient_11_2')

Can anyone help? Thanks in advance