---
schema_version: "1"
id: 5f4c8803b1833e5e8f4ac6a1a93cf95969532fb5e40237a1a6c458f0f2a25913
title: Tableau Server VizData Service
collection: tableau
version: current
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/current/en-gb/server/server_process_vizdata-service.md
canonical_url: https://help.tableau.com/current/server/en-gb/server_process_vizdata-service.htm
source_site: help.tableau.com
content_type: documentation
content_hash: c6ad9e18da4b42c48697a9cf4b90ae0899670cb941e846c94041cc53c4ecaf67
description: Understand the Tableau Server VizData Service for published data sources.
---
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# Tableau Server VizData Service

The VizData Service (vizdataservice) is the new service that handles the connections to published data sources on Tableau Server. Workbook queries to the published data sources on the Tableau Server are processed by the VizData Service. Prep Flow and Data Catalogue queries are handled by the Data Server.

To ensure high availability of VizData Service, configure one or more VizData Service processes on multiple nodes in the Tableau Server cluster.

**Note:** As of 2024.2.3, at least one instance of VizData Service is required for an installation of Tableau Server.

<table style="width: 100%;mc-table-style: url('Resources/TableStyles/Basic-Border.css');" class="TableStyle-Basic-Border" cellspacing="0"><colgroup><col class="TableStyle-Basic-Border-Column-Column1"><col class="TableStyle-Basic-Border-Column-Column1"></colgroup><tbody><tr class="TableStyle-Basic-Border-Body-Body1"><td class="TableStyle-Basic-Border-BodyE-Column1-Body1"><strong>Process</strong></td><td class="TableStyle-Basic-Border-BodyD-Column1-Body1"><p> VizData Service</p></td></tr><tr class="TableStyle-Basic-Border-Body-Body1"><td class="TableStyle-Basic-Border-BodyE-Column1-Body1"><strong>Status</strong></td><td class="TableStyle-Basic-Border-BodyD-Column1-Body1">Status of the  VizData Service process is visible on the Status Page. For more information, see <a href="https://help.tableau.com/current/server/en-gb/service_viewstatus.htm" class="xref">View Server Process Status</a></td></tr><tr class="TableStyle-Basic-Border-Body-Body1"><td class="TableStyle-Basic-Border-BodyB-Column1-Body1"><strong>Logging</strong></td><td class="TableStyle-Basic-Border-BodyA-Column1-Body1">Logs generated by the  VizData Service process are located in <code><code>C:\ProgramData\Tableau\Tableau Server\data\tabsvc\logs\</code>vizdataservice</code>. For more information, see <a href="https://help.tableau.com/current/server/en-gb/logs_loc.htm" class="xref">Tableau Server Logs and Log File Locations</a></td></tr></tbody></table>

What happens when a VizData Service fails? Requests to the published data sources being handled by that instance will fail (unable to render workbook view), but subsequent requests will be routed to other running VizData Service instances. Assuming the node containing the failed VizData Service is still running, the failed processes should be automatically restarted by Tableau Server.

The `control_vizdataservice_node*.log` contains information about the services starting and being enabled.

The `vizdataservice_node*.log` contains the errors or problems encountered.

The VizData Service will replace a portion of client traffic from Data Server to VizData Service when clients query and connect to the published data sources on the Tableau Server. If the VizData service process fails, the queries running through the VizData service will fail. The workbooks will lose the ability to query or connect to the published data sources.

### Recommendations

We recommend you configure an instance of VizData Service on a node with the same instances as Data Server and have both services enabled on a node to provide and manage connections to publish data sources on Tableau Server for various clients.

We recommend you configure an instance of VizData Service on each of the nodes where you deploy the Data Server. Together the services will provide and manage connections to published data sources on Tableau Server. Adding additional instances of VizData Service to other nodes provides duplication of processes and reduces the possibility of workbook downtime with VizData Service nodes.

Eventually the VizData Service will replace the Data Server in terms of the connection to the published data source on the Tableau Server. In the meantime it will still coexist, with Data Server service for backward compatibility.