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PowerBI Report Server Unable to load Oracle DB Data using Direct Query Connection

For your assistance please.


Created PBI Reports while using Power BI Desktop RS successfully loads data from Oracle DB using Direct Query Connection mode. However, once these PBI Reports (connecting to Oracle DB using Direct Query mode) are uploaded/published in Power BI Report Server, the PBI Reports unable to show data. No error pops up and only shows "loading data" and it seems just looping. Even just using a very simple data set but the data fails to load. 


Additional Info:

* The Power BI Report Server version is 2016.
* Version of ODAC is 12c.

* PBI Reports using Import Mode (Oracle DB) is working fine in the Power BI Report Server. It means connecting to Oracel DB using the Schedule Refresh successfully connects and retrieve data from Oracle DB.


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