ManagedDataAccess wants TNS listener

Question

Hi all;
I am trying to connect using the connection string: "USER ID=hr;PASSWORD=hr;DATA SOURCE=mercury:1521/XE"
My connector class is: "Oracle.ManagedDataAccess.Client" which I believe is the connector that does not require the Oracle fat client to be installed.
And I am getting the error:
Oracle.ManagedDataAccess.Client.OracleException occurred
  HResult=-2147467259
  Message=TNS:listener does not currently know of service requested in connect descriptor
  Source=Oracle Data Provider for .NET, Managed Driver
  ErrorCode=-2147467259
  DataSource=Oracle.ManagedDataAccess
  Number=12514
  Procedure=""
  StackTrace:
       at Oracle.ManagedDataAccess.Client.OracleException.HandleError(OracleTraceLevel level, OracleTraceTag tag, Exception ex)
       at OracleInternal.ServiceObjects.OracleConnectionImpl.Connect(ConnectionString cs, Boolean bOpenEndUserSession)
       at OracleInternal.ConnectionPool.PoolManager`3.CreateNewPR(Int32 reqCount, Boolean bForPoolPopulation, ConnectionString csWithDiffOrNewPwd)
       at OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString csWithDiffOrNewPwd)
       at OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString csWithNewPassword)
       at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, Byte[] securedPassword, Byte[] securedProxyPassword)
       at Oracle.ManagedDataAccess.Client.OracleConnection.Open()
       at AutoTagCore.net.windward.autotag.datasource.ado.ConnectionDebugger.btnConnect_Click(Object sender, EventArgs e) in c:\src\jenova\Dev\Merge\AutoTag\AutoTagCore\net\windward\autotag\datasource\ado\ConnectionDebugger.cs:line 346
  InnerException: OracleInternal.Network.NetworkException
       HResult=12514
       Message=TNS:listener does not currently know of service requested in connect descriptor
       Source=Oracle.ManagedDataAccess
       ErrorCode=12514
       Number=12514
       StackTrace:
            at OracleInternal.Network.OracleCommunication.DoConnect(String tnsDescriptor)
            at OracleInternal.Network.OracleCommunication.Connect(String tnsDescriptor, Boolean externalAuth)
            at OracleInternal.ServiceObjects.OracleConnectionImpl.Connect(ConnectionString cs, Boolean bOpenEndUserSession)
       InnerException:
Any idea why?
thanks - dave

Answer 1

While you only need to install the connector (ODP.NET, Managed Driver), you still need to configure Oracle DB server networking access. This requires setting up some configuration files or placing the configuration info in a .NET config file.
Networking is generally done through TNS, Easy Connect, or LDAP.
You can put the TNS or Easy Connect info right into the Data Source attribute of the connection string as well.