Error 127 “drivers may be out of date” Connecting to Oracle After Upgrade

Published: 19 Jun 2014
Last Modified Date: 30 Nov 2017


When you try to connect to an Oracle data source after you upgrade your Tableau Desktop product, the following error message might occur:

Function OCIArrayDescriptorAlloc not found in oci (error 127): drivers may be out of date
Unable to connect to the server "<server address>". Check that the server is running and that you have access privileges to the requested database.


  • Tableau Desktop
  • Oracle


The computer running Tableau Desktop is using the 64-bit Oracle drivers with 32-bit Tableau Desktop, or vice versa.

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