Error "An error occurred while communicating with the data source" Connecting to Oracle

Published: 15 Mar 2017
Last Modified Date: 08 Dec 2017


When you try to connect to Oracle, the following error occurs: 
An error occurred while communicating with the data source
Errors similar to the following can be found in the tabprotosrv logs:
  • Cannot load library from preferred location, "C:\Program Files\Tableau\Tableau <version>\bin\\<path>\ORAHOME\bin\oci.dll", since it doesn't exist.
  • Unable to load library "\\<path>\ORAHOME\bin\oci.dll" (error 87)


  • Tableau Desktop 10.2.0
  • Windows
  • Oracle


Try one of the following:
  • Remove the ORACLE_HOME environment variable if its not used by another process, or edit the PATH variable to match that of another user who can connect successfully to Oracle.
  • Copy the oraociei12.dll from  C:\Program Files\Tableau\Tableau <version>\bin to C:\oracle\product\10.2.0\client_1\bin\ .


Other oracle drivers may be interfering with Tableau Desktop connecting to Oracle using the Tableau Oracle driver.
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