Excel connect to Oracle – 64bit and 32bit issues

July 24th, 2014

Wow, thanks to

Process Monitor   https://www.technet.microsoft.com/en-us/sysinternals/bb896645

I was able track down why I couldn’t connect to Oracle from Excel.

I had wanted to try some of the examples Charles Hooper has posted on connecting to and monitoring Oracle, for example


I kept getting the error “Provider not found”
Now what kind of trace info is there for an error like this in Excel? None AFAIK. Time to start guessing.
I’m on windows 7 64 bit. I have the 64bit 11gR2 Oracle installed.  Excel shows up in task manager as “EXCEL.EXE  *32″. My first guess was, “oh, excel must want the 32bit libraries” so I got the 32 bit instant client from Oracle. Unzipped them into a directory and put them first into the path. Still no dice.
Did a lot of google searches and turned up that I needed


but this wasn’t in any of the instant client zips that I downloaded from


Turns out it’s in a download halfway down the page:

*Instant Client Package – ODAC: Includes ODP.NET, Oracle Services for MTS, Oracle Providers for ASP.NET, Oracle Provider for OLE DB, and OO4O with Oracle Instant Client

Downloaded this, put all the dlls in the first directory in my path. Still no dice.

I tried “strace”, but it gave no output. Rrrr.

Then I tried process monitor – bingo.

With process monitor, I filtered on processes containing “excel”, ran the connect, got tons of output, but knew it was a problem with libraries. I found “oraoledb10.dll” among the output. It was listed in an old Oracle 10 install directory. Oracle 10 32bit had been initially been installed. The install gave no warnings but bombed out late in the game so I remvoed the 10g and I installed Oracle 11gR2 64bit. (Oracle 11gR2 32bit won’t even begin the install)
So now, I scoured the registry with regedit and found the old oraoledb10.dll here


I changed this to the new location of oraoledb11.dll
and now it works.


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  2. | #1


    I encountered a similar error message a couple of years ago when using the through Oracle client installers, and wrote up a solution that I still use whenever I install the 32 bit Oracle client on a Windows computer, regardless if the computer is running 32 bit Windows or 64 bit Windows. See this article:

  3. | #2

    @Charles Hooper
    Correction: After re-reading my own article, it appears that this particular problem was introduced with the version of the Oracle client.

+ 7 = sixteen