44fbe20d62
yesterday's proposal to pghackers. Also remove unnecessary parameters to heap_beginscan, heap_rescan. I modified pg_proc.h to reflect the new numbers of parameters for the AM interface routines, but did not force an initdb because nothing actually looks at those fields.
This module contains two functions that report the size of a given
database or relation. E.g.,
SELECT database_size('template1');
SELECT relation_size('pg_class');
These functions report the actual file system space. Thus, users can
avoid digging through the details of the database directories.
Copy this directory to contrib/dbsize in your PostgreSQL source tree.
Then just run make; make install.