Install the Oracle client version V979518-01.
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Open the Client folder and double-click setup.exe.
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Select Administrator and click Next.
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In the Select Product Languages window, select English, click , and click Next.
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In the Oracle Home User Selection window, select Use Windows Built-in Account, and click Next.
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Click Next.
If you want to change the Oracle base or software location, click Browse and select another directory.
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In the Summary window, click Install.
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When the installation is finished, click Close.
Copy Oracle TNS Names
You must copy the tnsnames.ora and sqlnet.ora files from the database installation folder to the client installation folder.
Copy these files from %Oracle_DB_InstallFolder%\NETWORK\ADMIN folder to the Oracle client installation folder: %Oracle_Client_InstallFolder%\NETWORK\ADMIN.
Register Oracle.DataAccess.dll
After you finished Oracle client installation, you must manually register the Oracle.DataAccess.dll to Global Assembly Cache (GAC).
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Open a Command Prompt window as administrator.
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Type the command to navigate to the ODP.NET folder, which is in the Oracle installation location:
cd <Oracle installation drive>\<Oracle installation folder>\product\18.x.x\client_1\ODP.NET\bin\4
For example:
cd D:\Oracle18\product\18.x.x\client_1\ODP.NET\bin\4
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To register the dll, type the command:
oraprovcfg /action:gac /providerpath:<Oracle Installation Drive>\<Oracle installation folder>\product\18.x.x\client_1\ODP.NET\bin\4\Oracle.DataAccess.dll
For example:
oraprovcfg /action:gac /providerpath:D:Oracle18\product\18.x.x\client_1\ODP.NET\bin\4\Oracle.DataAccess.dll