Como identificar quanto as tabelas do Eligo estão consumindo do disco?

select relname
, pg_relation_filepath(relname||' ')
, pg_size_pretty(pg_total_relation_size(relname||' '))
from pg_class c
join pg_namespace n on n.oid = c.relnamespace 
where relkind='r'
and nspname = 'public'
order by pg_total_relation_size(relname||' ') DESC
;