Are you talking about on our servers,
glimmer.rstudio.com and
spark.rstudio.com? We don't have Oracle's OCI libraries installed there, no. Normally we're not averse to installing database client libraries but in this case there are no standard packages in the Ubuntu repositories, so I think we'd rather not support it unless there is great demand.
Would it be possible for you to periodically snapshot the data you need and upload it as a .csv or something? (Or else you could always run your own server on Amazon Web Services if you don't mind a little Linux system administration...)