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Error "Unknown Failure" when Refreshing Oracle Extract


Published: 23 Oct 2014
Last Modified Date: 06 May 2016

Issue

When connecting to an Oracle database, or refreshing an extract of an Oracle data source, the connection might fail with the following error message:

Unknown failure

Environment

  • Tableau Server 8.2.1
  • Oracle

Resolution

  • Upgrade Tableau Server to 8.2.3 or later version. For more information, see Upgrading Tableau Server.
  • Ensure that the computer running Tableau Server meets minimum specifications of 4 cores and 8 GB ram.

Additional Information

The following entries might also appear in the backgrounder logs:

ExternalProtocol::PipeMessageSource::ReadBytes: No process is on the other end of the pipe.
ExternalProtocol::PipeMessageSink::WriteBytes: Communication with the Tableau Protocol Server process was lost.
Fatal Exception: Communication with the Tableau Protocol Server process was lost.
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