Accessing system information functions

Environment: Ubuntu 22.04 lts, postgres 15 installed via postgres.org<http://postgres.org> repository

I am attempting to use the system information functions here: https://www.postgresql.org/docs/15/functions-info.html

I’m logged on as the postgres superuser on the host

Trying any of the functions gives me a syntax error

postgres=# pg_database_size(avi);

ERROR: syntax error at or near "pg_database_size"

LINE 1: pg_database_size(avi);

Do I have to add anything to the search_path?

postgres=# show search_path;

search_path

-----------------

"$user", public

(1 row)

--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs