We have a requirement to connect Reporting Services 2008 R2 x64 + Report Builder 3.0 to Oracle database and also to build a web application which connects to Oracle.
I installed ODAC (Oracle Data Access Components) which contains ODP.NET (Oracle Data Provider for .NET) and Instant Client (required by the provider).
Now the problem is how to make Report Designer, Reporting Services and Report Builder 3.0 to add ODP.NET as an Oracle provider in the drop down list contained by the Data Source Wizard?
I found out that Reporting Services and Report Builder work based on Data Extensions so I added Oracle.DataAccess as extension to RsReportServer.config and RsReportDesigner.config as shown in: http://www.bigresource.com/Tracker/Track-ms_sql-aIXqXMEE/.
By changing RsReportDesigner the ODP.NET appeared in the list for Report Designer (Business Intelligence Studio) but it couldn't be used because an error was thrown as soon as Test Connection was pressed stating that the provider is not registered with the application.
With these changes ODP.NET does not appear in the list of providers for Reporting Services and Report Builder 3.0.
For now I managed to connect to Oracle through .NET Provider for Oracle (provided by default) but this seems to be deprecated and in Report Builder 3.0 I can't select tables to be added to the query, I'm prompted only with a blank textbox and one exclamation mark for execution.