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How to Fix ODBC Data Source Name Not Found Error in Oracle Client 19

Huma Ashraf Ch Sep 25, 2026 872 views

Question details

The user needs to resolve an ODBC Driver Manager connection failure where the data source name (DSN) cannot be found and no default driver is specified.

How to Fix ODBC Data Source Name Not Found Error in Oracle Client 19

Product: Oracle Client 19
Device & OS: not provided
Scenario: Attempting to establish a database connection to Oracle Client 19 through an application, automation process, or ODBC interface.
Observed behavior: The system throws a 'data source name not found and no default driver specified' error, preventing successful database connectivity.

Before you start

Ensure you have administrative privileges on your computer to access the ODBC Data Source Administrator and verify that your Oracle Client installation path is correct.

Solution 1Recommended

Match the Application and ODBC Administrator Architecture

Verify that your application, Oracle Client, ODBC driver, and DSN all use the exact same architecture (either 32-bit or 64-bit) to ensure compatibility.

One of the most common reasons for this error is a mismatch between 32-bit and 64-bit components. If you are using a 32-bit application, you must use the 32-bit Oracle Client and configure the DSN in the 32-bit ODBC Data Source Administrator, even if you are running a 64-bit Windows operating system.

Open the correct ODBC Data Source Administrator

Press Windows + S and type 'ODBC'. Select either 'ODBC Data Sources (32-bit)' or 'ODBC Data Sources (64-bit)' strictly based on the architecture of the application you are using to connect to the database.

Check registered drivers

Navigate to the 'Drivers' tab within the ODBC Data Source Administrator. Scroll through the list to confirm that the Oracle ODBC driver (e.g., 'Oracle in OraClient19Home1') is installed and properly registered.

Reinstall client if necessary

If the driver is missing from the list, download and install the correct architecture version (32-bit or 64-bit) of the Oracle Client 19 from the official Oracle website.

Match the Application and ODBC Administrator Architecture

Architecture Identification: To check if your application is 32-bit or 64-bit, open the Task Manager (Ctrl + Shift + Esc), find your application in the 'Details' tab, and check its architecture column or process properties.

Solution 2

Create and Configure the Data Source Name (DSN)

Set up a System DSN and configure necessary environment variables like PATH and TNS_ADMIN to help the driver manager locate the connection details.

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Frequently Asked Questions

Why does the ODBC driver manager say 'data source name not found'?

This error typically occurs when the application attempts to connect to a database but cannot locate the specified Data Source Name (DSN) in the Windows registry. This happens if the DSN was never created, was created under the wrong user profile, or was configured in the wrong ODBC administrator (such as using the 64-bit tool for a 32-bit application).

How do I know if I need the 32-bit or 64-bit Oracle ODBC driver?

The architecture of the ODBC driver must match the architecture of the application making the connection, not the operating system. For example, if you are using a 32-bit data automation tool on a 64-bit Windows machine, you must install the 32-bit Oracle Client and configure the DSN in the 32-bit ODBC Administrator.

Where can I find and edit the TNS_ADMIN environment variable?

The TNS_ADMIN variable is located in the Windows Environment Variables. Press the Windows key, search for 'Edit the system environment variables', click 'Environment Variables', and look under 'System variables'. If it does not exist, you can create it and set its value to the network\admin directory of your Oracle Client installation where the tnsnames.ora file resides.

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Yes, WPS Spreadsheets supports various data connection methods. You can import data from external databases as long as the appropriate ODBC drivers and System DSN configurations are correctly set up and matching the architecture of your WPS Office installation.

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