Troubleshooting connection issue between Oracle Database & OpKey
 

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Troubleshooting connection issue between Oracle Database & OpKey

Radhe Shyam Prajapati 06.07.2018
Symptoms: 
 
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' is constrained 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: 
 
Resolution for the above cause is to remove one row from machine.config file of Microsoft.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, PublicKeyToken=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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