Yes, you are correct. In Virtual DataPort Administration Tool, you could navigate to the server explorer and double-click on the Teradata data source that you have created. Then, in the data source **[Connection](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/jdbc_sources/jdbc_sources#jdbc-data-source-connection-tab)** tab of the **configuration** tab, you will be able to see the **Connection Pool configuration**, click on that and add the below expression in the Ping query. Then, save the datasource.
**SET QUERY_BAND='PROXYUSER=user_name;' FOR SESSION; **
For more information, please refer to the section [JDBC Sources](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/jdbc_sources/jdbc_sources#jdbc-sources) of Virtual DataPort Administration Guide.
Alternatively, you can also copy the VQL of your Teradata datasource and paste it in the VQL shell, edit the **VALIDATIONQUERY** with the above expression and execute. This alternative approach is equivalent to the Ping query change.
Hope this helps!