如何测量数据库表中数据的大小？

Question

I have a number of tables containing data (in Postgres), and would like to know how 'big' my data is. How can I measure this?

The only ways I can think of is to either:

Calculate the size of each row (based on the data types) and multiply by the number of rows (but this won't be accurate when my data is normalized)

or:

Denormalize the data with a bunch of joins and export the result to CSV and look at the size of the file.

Is there another (easier) way to do this?

Answer 1

内置函数pg_database_size()可用于获取整个数据库的大小（包括索引，内置模式等）。

SELECT pg_size_pretty( pg_database_size( current_database() ) );