PostgreSQL查看数据库，表和索引的大小

1. 查看数据库大小。 

 

select pg_size_pretty(pg_database_size('db_name')); 

 

通过 pgAdmin 我们可以看到，在 PostgreSQL(pg_catalog) 下有如下两个视图： 

pg_stat_user_tables，pg_stat_user_indexes。可以通过它们来查看表及索引的大小。 

 

2. 查看所有索引的大小。 

 

select indexrelname, 

       pg_size_pretty(pg_relation_size(indexrelname)) 

from pg_stat_user_indexes 

where schemaname = 'public' 

order by pg_relation_size(indexrelname) desc; 

 

3. 查所有表的大小。 

 

select relname, 

       pg_size_pretty(pg_relation_size(relname)) 

from pg_stat_user_tables 

where schemaname = 'public' 

order by pg_relation_size(relname) desc; 

 

4. 查看单个表的大小。 

 

select pg_size_pretty(pg_relation_size('table_name'));