---
schema_version: "1"
id: fc8ec19864e77cef581d6bdbbdbed31d84e6284d81d451a748d30cb23f5e5f84
title: Zero Downtime Licensing
collection: tableau
version: current
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/current/en-gb/server/license_zero_downtime.md
canonical_url: https://help.tableau.com/current/server/en-gb/license_zero_downtime.htm
source_site: help.tableau.com
content_type: documentation
content_hash: 819b4eae3d17188315678791ec2ef719433d80e73cba62f7b59a86ded2a6ba01
description: Apply most Tableau Server licensing changes without restarting using zero downtime licensing.
---
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# Zero Downtime Licensing

With zero downtime licensing, which was introduced in Tableau Server version 2021.1, you can apply most licensing changes to Tableau Server without needing to restart when licence end dates, capacity or installed features are changed.

## When should you restart Tableau Server?

When you apply a licence update that does not require a restart, Tableau Server displays the following message: Updated Licensing details are being applied across Server. However, there are some situations when applying a licence update that require you to restart Tableau Server. For example, if you are activating or deactivating a product key that reduces features or changes the allowed data source connections, you'll need to restart Tableau Server after making your changes. When a restart is required, Tableau Server will display the following message: Restart Server to apply updated Licensing details. The following table lists the times when licence changes require you to restart Tableau Server.

<table style="width: 100%;" class="simple-table"><colgroup><col><col></colgroup><tbody><tr><th>Licence change</th><th>Restart required?</th></tr><tr><td>Extending a licence term</td><td>No</td></tr><tr><td>Adding or reducing user licence capacity</td><td>No</td></tr><tr><td>Adding core licence capacity</td><td>No</td></tr><tr><td>Reducing core licence capacity</td><td>Yes</td></tr><tr><td>Adding a <span class="mc-variable Variables.DM_sku variable">Data Management</span> or <span class="mc-variable Variables.ITM_name variable">Advanced Management</span> licence</td><td>No</td></tr><tr><td>Removing a <span class="mc-variable Variables.DM_sku variable">Data Management</span> or <span class="mc-variable Variables.ITM_name variable">Advanced Management</span> licence</td><td>Yes</td></tr><tr><td>Changing allowed data sources</td><td>Yes</td></tr><tr><td>Expired product key</td><td>Yes</td></tr></tbody></table>