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Hi Kurt Slater,
+ Neo4j is not a supported data source currently and that Tableau Online only supports live connections to web-hosted MySQL, Postgres and MSSQL Server databases
+ An alternate solution could be to use the Sync Client to refresh the data up to every 15 minutes, please refer to the following Product Help link for information regarding the Sync Client:
Scheduling Refreshes for On-Premises Data
Additionally, the live connection is not live in terms of live streaming from the database, but live querying. This means when a user interaction with a view, for example refreshing the view, is made, Tableau will open a connection to the database, query the database and then close the connection. The following Community post does a great job of explaining live connections: http://community.tableau.com/thread/130416
Furthermore, it may be possible to use a live connection by whitelisting the Tableau Online IP range (220.127.116.11/24), however if it is not a supported web hosting provider, it will be outside the scope of support to troubleshoot the connection.
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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