PRB: Connectivity Issue with MDAC and Oracle8i

When you attempt to connect to an Oracle 8i database by using the Oracle 8i client and the Microsoft Oracle ODBC Driver (MSORCL32.DLL) version 2.573.4403 (or later) or the MS Oracle Provider (MSDAORA.DLL) version 2.50.4403.0 (or later), you may receive the following error message:

Different registry entries are necessary to ensure that various Oracle OCI versions operate correctly. To enable the OLE DB Provider or the ODBC Driver for Oracle to work with Oracle client software, the client's registry must be modified. The MDAC installation may not register the required registry entries.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
Change the registry setting as described in the "Known Issues for MDAC 2.5 RTM (2.50.4403.12)" section of the following release manifest: The following file is available for download from the Microsoft Download Center:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

MDAC 2.5 is the first supported version of Microsoft Data Access Components for Oracle8i. You can download the latest version of MDAC from the following location: The table below shows the registry entries for each version of the Oracle Client described on the MDAC 2.5 Release Manifest webpage. These changes will also need to be made for MDAC 2.6 and 2.7.



For Microsoft Windows 2000 or Windows XP systems:

1. Run RegEdit.
2. Under the following RegKey, edit OracleOciLib, and then set it to the correct values in the previous table:

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\MTxOCI
   						

   NOTE: If this key has not been added automatically by setup, add "OracleOciLib" to the registry.

For Microsoft Windows NT 4.0 or Microsoft Windows 95 or Windows 98 systems:

1. Run RegEdit.
2. Under the following RegKey, edit OracleOciLib and set it to the correct values in the previous table:

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Transaction Server\Local Computer\My Computer
   					

   NOTE: This key must be added manually using RegEdit.

For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base: