Postgres database view data table size

1 Check the size of a database

select pg_database_size('【数据库名】');

2 View multiple database sizes

select pg_database.datname, 
	   pg_size_pretty (pg_database_size(pg_database.datname)) 
AS size 
from pg_database; 

3 View the index in order

select indexrelname, pg_size_pretty(pg_relation_size(relid)) 
from pg_stat_user_indexes 
where schemaname='public' 
order by pg_relation_size(relid) desc;

4 View the size of all tables

select relname, pg_size_pretty(pg_relation_size(relid)) 
from pg_stat_user_tables 
where schemaname='public' 
order by pg_relation_size(relid) desc;

5 View the size of a specific table

select relname, pg_size_pretty(pg_relation_size(relid)) 
from pg_stat_user_tables 
where schemaname='public' and relname='【表名】'
order by pg_relation_size(relid) desc;