On Wed, 2021-06-30 at 16:14 +0200, Christian Lehmann wrote: > Now my question: Is it possible to see if a certain extension is in > active use? BEGIN; DROP EXTENSION plpython3u; ROLLBACK; If you can drop the extension, no objects depend on it. For example, that will show if there are any PL/Python functions defined. If you want to know if PL/Python functions are used, monitor "pg_stat_user_functions" (after enabling "track_functions") and see if the number of calls is growing. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com