In addition to oid2name mentioned, you might want to know
about system catalog schema.

It's explained in manual

Yasuo Ohgaki

Robert Abbate wrote:
> Greetings to all!
> I have a webhosting company, and I'm trying to be able to use PHP to
> calculate each of my hosting customer's Postgres database disk usage. It
> doesn't seem as easy as MySQL (since MySQL uses the user name to store all
> their database files).
> Does anyone know how I can calculate PostgreSQL disk space usage for each of
> my hosting user accounts?
> It seems I'm going to have to find out how Postgres keeps track of which
> user's database name is and it's corresponding number (so far, I've been
> able to determin that Postges uses numbers instead of names).
> Can anyone give me some insight?
> Thanks!
> Robert

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