I tested this on my Tableau Server sandbox and tabadmin cleanup had no affect on the Administrative views. I could still see records from 6 months ago (when I installed Tableau Server).
The records on the Tableau Server Administrative views can stretch back for years.
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Just a caveat that not all records are kept for 6 months under some circumstances:
The tabadmin set option auditing.enabled controls whether Tableau Server collects historical user activity and other information in the repository. It is enabled by default. Be aware that collecting historical events impacts the size of Tableau Server's backup file (.tsbak).
- All hist_ tables are controlled by the tabadmin set option wgserver.audit_history_expiration_days, which controls how many days of event history are kept in the repository and has default value of 183 days.
- The _http_requests table is cleaned of all data older than 7 days every time tabadmin cleanup or tabadmin backup is used. For more information, see Remove Unneeded Files.
- The _background_tasks table is cleaned automatically and keeps data for the last 30 days.
- All other tables with names that begin with a "_" prefix contain current data.