查看Postgresql每个表的大小

不知道是哪个大神写的，因为我从别人的blog看到的时候，别人也注明说是忘记哪个大神写的。所以，对原创者很抱歉，不能写出来源了。

SELECT
schemaname as schema,
tablename as table_name,
pg_size_pretty(pg_relation_size(schemaname || '.' || tablename)) AS size_p,
pg_total_relation_size(schemaname || '.' || tablename) AS siz,
pg_size_pretty(pg_total_relation_size(schemaname || '.' || tablename)) AS 表总大小,
pg_total_relation_size(schemaname || '.' || tablename) - pg_relation_size(schemaname || '.' || tablename) AS 索引大小,
(100*(pg_total_relation_size(schemaname || '.' || tablename) - pg_relation_size(schemaname || '.' || tablename)))/CASE WHEN pg_total_relation_size(schemaname || '.' || tablename) = 0 THEN 1 ELSE pg_total_relation_size(schemaname || '.' || tablename) END || '%' AS index_pct
FROM pg_tables
ORDER BY siz DESC 

以下为SQL执行结果：