in addition to the server, username and password, are you also specifying the service? I believe Tableau needs this to successfully connect, or at least that's how it is in our environment when connecting to Oracle. Maybe try putting in BIGDATA for both the server host and service.
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Apparently, I cant read, or type.
- I neglected to create the environment variable TNS_ADMIN.
- The TNSNames.ora file was missing a closing blacket
all is good now though
ah, great. Please mark as correct.