I work with Oracle DB and it works fine for that as well (both desktop & server )
1) Go to Data Sources and select your connection & then edit
Can do with desktop as well
Are you using a new machine (need to install Oracle driver then )?
1.) Did you download and install the Tableau 8.0 Oracle Drivers? http://www.tableausoftware.com/drivers
2.) Do you already have a working TNSnames.ora setup on the same machine as Desktop? e.g. do you have TOAD or other Oracle-connecting products up and running? http://kb.tableausoftware.com/articles/knowledgebase/oracle-connection-errors
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It turned out I just needed to reboot my machine. Very strange, but thanks for the suggestion.