OraOLEDB Oracle provider is not registered on the local machine

Question

I just migrated from XP to Win 7  I am guessing this error has to do with switching operating systems  I wrote a  net application that basically massages a large amount of data and then connects to a database and inserts updates a table   When I hit a button to connect to the database I run into the error regarding the oracle provider not being registered on my local machine   A clear  step by step outline of how I can fix this quickly would be much appreciated   The exact error message is       OraOLEDB Oracle 1  provider is not registered on the local machine

User · Answer

Right Click on My Computer Click on properties Click on Advanced System Settings Click on  Environment Variables  button  In the system Variable section find the  PATH  variable Edit the  PATH  variable and add Oracle installation path to it  from your local machine  like  C  oracle product 10 2 0 client 1 bin

User · Answer

It only worked for me after I changed the  Platform target  to  x64   considering I m using Oracle 12c 64 bits   To do that  I did    Right click on the project name  at the Solution Explorer panel locate  in general  at the left  Clicked on  Build   in the new opened window  Changed the  Platform target  from  Any CPU  to  x64     That solved the problem

User · Answer

I had the same issue using IIS   Make sure the option  Enable 32bit Applications  is set to true on Advanced Configuration of the Application Pool

User · Answer

If you are getting this in a C  projet  check if you are running in 64-bit or 32-bit mode with the following code            if  IntPtr Size    4                        Console WriteLine  This is 32-Bit                       else if  IntPtr Size    8                        Console WriteLine  This is 64 Bit                 If you find that you are running in 64-Bit mode  you may want to try switching to 32-Bit  or vice versa   You can follow this guide to force your application to run as 64 or 32 bit  X64 and X86 respectively   You have to make sure that Platform Target in your project properties is not set to Any CPU and that it is explicitley set      Switching that option from Any CPU to X86 resolved my error and I was able to connect to the Oracle provider

User · Answer

I had the same issue but my solution was to keep the Platform target as Any CPU and UNCHECK Prefer 32-bit checkbox  After I unchecked it I was able to open a connection with the provider

User · Answer

Building on Der Wolfs tip  I uninstalled the Oracle client and installed it again  right-clicking on the setup program  and running it as Administrator  It worked

User · Answer

My team would stumble upon this issue every now and then in random machines that we would try to install our platform in  we use oracle drivers 12c ver 12 2 0 4 but we came across this bug with other versions as well   After quite a bit of experimentation we realized what was wrong   Said machines would have apps that were using the machine-wide oracle drivers silently locking them and preventing the oracle driver-installer from working its magic when would attempt to upgrade reinstall said oracle-drivers  The sneakiest  app  would be websites running in IIS and the like because these apps essentially auto-start on reboot  To counter this we do the following    Disable IIS from starting automagically on restart  Do the same for any other apps services that auto-start themselves on reboot  Uninstall any previous Oracle driver and double-check that there are no traces left behind in registry or folders  Reboot the machine  Re Install the Oracle drivers and re-enable IIS and other auto-start apps  Reboot the machine  lt - This is vital  Oracle s OLE DB drivers won t work unless you reboot the machine    If this doesn t work then rinse repeat until the OLE DB drivers work  Hope this helps someone out there struggling to figure out what s going on

User · Answer

After spend hours to fix that  and for some who installed it uncorrectly  you need to uninstall current version and reinstall it again as Administrator

User · Answer

I had the same issue after installing the 64 bit Oracle client on Windows 7 64 bit   The solution that worked for me    Open a command prompt in administrator mode cd  oracle product 11 2 0 client 64 BIN c  Windows system32 regsvr32 exe OraOLEDB11 dll

User · Answer

If you can t change compile use x64  try uninstall x64 version of odac and install 32bit version  Then  don t forget to add install directory like C  oracle and also the child directory C  oracle bin to the PATH environment variable  This worked out for me in  net 4 application

User · Answer

Do the following test   Open a Command Prompt and type  tnsping instance name  where instance name is the name of the instance you want to connect  if it s a XE database  use  tnsping xe   If it returns ok  follow steps of Der Wolf s answer  If doesn t return ok  follow steps of Annjawn s answer   It solved for me in both cases

User · Answer

If you have windows 64 bits  try to install oracle driver 32 bits first then 64 bits driver  thats what i do and is working

[c#] OraOLEDB.Oracle provider is not registered on the local machine

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