Issue: - Troubleshooting connection issue between Oracle Database & Opkey

Platform

Opkey On-Premise and SaaS.

Solution

While connecting Opkey with the Oracle database, located on local or remote machine, Opkey users come across such issues:

System.Configuration.ConfigurationErrorsException: An error occurred creating the configuration section handler for system.data: Column ‘InvariantName’ isconstrained to be unique. Value ‘Oracle.DataAccess.Client’ is already present.

Cause: 
The most common cause of such type of issue is installing or uninstalling of ODAC driver multiple times.

Resolution: The resolution for the above cause is to remove one row from the machine.config file ofMicrosoft.Net folder.
The machine.config file can be found at the following path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config
The row to be deleted is given below: 
“<add name=”ODP.NET, Unmanaged Driver” invariant=”Oracle.DataAccess.Client”description=”Oracle Data Provider for .NET, Unmanaged Driver”type=”Oracle.DataAccess.Client.OracleClientFactory, Oracle.DataAccess,Version=4.121.1.0, Culture=neutral, Public Key Token=89b483f429c47342″ />

Note:
Check before row deletion: Please check that the row with the above given value exists twice in the machine.config file. Now remove the last row with these values.

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