> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/install/9.3-install/pentaho-configuration/tasks-to-be-performed-by-an-it-administrator/configure-the-pentaho-server/specify-data-connections-for-the-pentaho-server/jdbc-database-connections/set-up-jndi-connections-for-the-pentaho-server/add-drivers.md).

# Add drivers

The Pentaho Server needs the appropriate driver to connect to the database that stores your data. Your database administrator, Chief Intelligence Officer, or IT manager should be able to provide the appropriate driver. If not, you can download drivers from your database vendor's website. The [Components Reference](/install/9.3-install/components-reference.md) contains a list of drivers.

Once you have the correct driver, copy it to the following directories:

* Pentaho Server: `/pentaho/server/pentaho-server/tomcat/lib/`
* PDI client: `data-integration/lib`

You must restart PDI client for the driver to take effect.

There should be only one driver for your database in the directory. Ensure that there are no other versions of the same vendor's driver in this directory. If there are, back up the old driver files and remove them to avoid version conflicts. This is a concern when you are adding a driver for the same database type as your Pentaho Repository. If you have any concerns about how to proceed, contact [Pentaho Support](https://support.pentaho.com).


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