In this day and age of clouds and what not, it is still important to keep tabs on your database growth to ensure it doesn't
outgrow your disks or so that you can be prepared when it does. A common question that is asked is how big your database is or all your databases combined.
Luckily PostgreSQL has had for a long time functions to help you answer this easily. In this little article,
I'll demonstrate how to answer these questions and more with some PostgreSQL built-in functions