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for this case you need to use postgres db which is backend for tableau server
Check the below link how to access tableau server :
you will get good amount SQL queries already predefined so that you will get all the information what you asked for.
Hope this helps kindly mark this answer as correct or helpful so that it will help others
Thanks, Naveen. can we use same way for tableau online?
In Tableau Online, you can access the default administrator views under the 'Status' tab, but you connecting to the PostgreSQL repository is currently a feature request you can up-vote here: https://community.tableau.com/ideas/4750
tableau refreshextract --help