cx_Oracle: ImportError: DLL load failed: The specified procedure could not be found

Question

I have suddenly got a problem that I can no longer import cx_Oracle in python. I know that a lot of people have had a similar error message as mine, which is: The specified PROCEDURE could not be found. I was wondering if there are any ways to trouble shoot this problem.

I'm running

- instantclient_12_1 
- python 3.4 64 bit
- cx_Oracle-5.2.1-12c.win-amd64-py3.4.exe

I have set the path and ORACLE_HOME environment variables to mmy instaclint 12_1 folder.

What else could be the problem? The dependency walker shows the following:

Does this mean that it doesn't find OCI.DLL? This file is definitely in the instaclient_12_1 folder which is listed in both ORACLE_HOME and PATH environment variable.

Answer 1

Please install according to Instant Client 12.1 requirement from https://www.oracle.com/de/database/technologies/instant-client/winx64-64-downloads.html

the required Visual Studio VS 2010 redistributable libraries for VS2010 SP1 and C++

https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

and bounce machine