>> (b) How can I verify that my databases are being vacuumed by autovacuum?
>>
>
> pg_stat_user_tables should have a last_autovac column.
>
Also, you can see autovacuum related messages like:
DEBUG: autovacuum: processing database "postgres"
DEBUG: autovacuum: processing database "template1"
in your server log, by setting log_min_messages to 'debug1' in your
postgresql.conf.
As a side effect you may also see some other messages enabled with the
same debug level,