I wanted to report on the different types of data sources used in our Tableau instance — as well as show how many of each type are in use.
-- Query to found how many of each data source type
select datasources.db_class, count(datasources.db_class) as count
from datasources
left outer join users on users.id = datasources.owner_id
left outer join system_users on users.system_user_id = system_users.id
left outer join sites on datasources.site_id = sites.id
left outer join projects on datasources.project_id = projects.id
left outer join workbooks on datasources.parent_workbook_id = workbooks.id
group by datasources.db_class
order by count desc ;
Answer: About half of them are Oracle!
