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Open Command Prompt as Administrator, navigate to that folder, and run: odbc_install.exe
Create a variable named TNS_ADMIN pointing to the folder where your tnsnames.ora file lives. Step 4: Configure the Data Source Once installed, you need to tell Windows how to use it: download odbc driver oracle
Extract both the Basic and ODBC packages into the same folder (e.g., C:\oracle\instantclient ). Open Command Prompt as Administrator, navigate to that