Are you certain that all tables are included in `pg_stat_vacuum_tables`?
I'm asking because of the following:
SELECT count(*) FROM pg_stat_all_tables ;
count
-------
108
(1 row)
SELECT count(*) FROM pg_stat_vacuum_tables ;
count
-------
20
(1 row)
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Regards,
Ilia Evdokimov,
Tantor Labs LCC.