Postgres Objects size vacuum structure etc

postgres_structure.md

Biggest Tables

SELECT nspname || '.' || relname                     AS "relation",
       pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
FROM pg_class C
         LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ('pg_catalog', 'information_schema')
  AND C.relkind <> 'i'
  AND nspname !~ '^pg_toast'
ORDER BY pg_total_relation_size(C.oid) DESC
LIMIT 50;

Tables with Dead Tuples

SELECT schemaname, relname, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
where relname in ('t1',
                  't2')
ORDER BY n_dead_tup;

Vacuum and Analyse stats

SELECT  relname, last_vacuum, last_autovacuum, last_analyze, last_autoanalyze
FROM pg_stat_user_tables
order by last_autovacuum desc;