guzya@guzya-desktop ~ $ pid=$(docker run -d --rm -p 5432:5432 -e POSTGRES_PASSWORD=password postgres:13) && docker exec -it $pid bash && docker stop $pid

root@97a3ed9b58c3:/# psql -U postgres
psql (13.2 (Debian 13.2-1.pgdg100+1))
Type "help" for help.

postgres=# select 
postgres-#     (schemaname||'.'||relname) as name
postgres-#     ,pg_relation_size(schemaname||'.'||relname) as size
postgres-#     ,pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) as p_size
postgres-#     ,pg_size_pretty(pg_total_relation_size(schemaname||'.'||relname)) as total_size
postgres-#     ,pg_size_pretty(pg_indexes_size(schemaname||'.'||relname)) as i_size
postgres-#     ,n_live_tup
postgres-#     ,n_dead_tup
postgres-#     ,trunc(n_dead_tup/(n_live_tup*0.01),2) as k
postgres-#     ,last_autovacuum 
postgres-#     ,(select relname from pg_class c where c.oid=(select cc.reltoastrelid from pg_class cc where  cc.relname=t.relname)) as toast
postgres-# from pg_stat_all_tables t 
postgres-# where 
postgres-#     schemaname not in('pg_catalog','information_schema') 
postgres-#     and n_live_tup > 0 
postgres-# order by size desc,k ;

 name | size | p_size | total_size | i_size | n_live_tup | n_dead_tup | k | last_autovacuum | toast 
------+------+--------+------------+--------+------------+------------+---+-----------------+-------
(0 rows)

postgres=# create table t1(id1 int,id2 int,id3 int, sss text);
CREATE TABLE

postgres=# insert into t1 (select s.id,s.id,s.id,repeat(s.id::text,s.id) from
generate_series(1,100000) as s(id));
INSERT 0 100000

postgres=# select                                                            
    (schemaname||'.'||relname) as name
    ,pg_relation_size(schemaname||'.'||relname) as size
    ,pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) as p_size
    ,pg_size_pretty(pg_total_relation_size(schemaname||'.'||relname)) as total_size
    ,pg_size_pretty(pg_indexes_size(schemaname||'.'||relname)) as i_size
    ,n_live_tup
    ,n_dead_tup
    ,trunc(n_dead_tup/(n_live_tup*0.01),2) as k
    ,last_autovacuum 
    ,(select relname from pg_class c where c.oid=(select cc.reltoastrelid from pg_class cc where  cc.relname=t.relname)) as toast
from pg_stat_all_tables t 
where 
    schemaname not in('pg_catalog','information_schema') 
    and n_live_tup > 0 
order by size desc,k ;

          name           |   size    | p_size | total_size | i_size  | n_live_tup | n_dead_tup |  k   |        last_autovacuum        |     toast      
-------------------------+-----------+--------+------------+---------+------------+------------+------+-------------------------------+----------------
 pg_toast.pg_toast_16384 | 294215680 | 281 MB | 284 MB     | 3560 kB |     161151 |          0 | 0.00 | 2021-10-29 09:11:38.107185+00 | 
 public.t1               |  43196416 | 41 MB  | 325 MB     | 0 bytes |     100000 |          0 | 0.00 | 2021-10-29 09:11:29.703272+00 | pg_toast_16384
(2 rows)

postgres=# \d pg_toast.pg_toast_16384

TOAST table "pg_toast.pg_toast_16384"
   Column   |  Type   
------------+---------
 chunk_id   | oid
 chunk_seq  | integer
 chunk_data | bytea
Owning table: "public.t1"
Indexes:
    "pg_toast_16384_index" PRIMARY KEY, btree (chunk_id, chunk_seq)