PostgreSQL查看数据库表的大小

From PgsqlWiki

• pg_relation_size('关系名') - 查看关系大小

   jianingy=# select pg_relation_size('contact');
    pg_relation_size 
   ------------------
              425984
   (1 row)

• pg_size_pretty - human readable的大小输入

   jianingy=# select pg_size_pretty(pg_relation_size('contact'));
    pg_size_pretty 
   ----------------
    416 kB
   (1 row)

• 查看所有public schema里面索引大小，大到小的顺序排列

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

• 查看所有public schema里面表的大小，从大到小顺序排里

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