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Tableau Help > Tableau Server for Windows Help > 

Database Drivers

The installers for Tableau Server and Tableau Server Workers automatically install drivers for Oracle and Oracle Essbase databases. If you plan to publish workbooks and data sources that connect to other databases, you will need to make sure that both your primary and worker servers have the corresponding drivers.

Workers running VizQL, application server, data server, or backgrounder processes need these database drivers. For example, if you have a worker dedicated as a VizQL server and another computer dedicated to extract storage, you only need to install drivers on the computer running the VizQL server process.

Server process Requires database driver?
VizQL server yes
Application server yes
Data server yes
Backgrounder yes
API server yes
Data engine (extract storage) no
Repository no
Gateway no
Cluster controller no
Cache server no
Search & Browse no
File store no