Minimum priv_type settings for secure MySQL setup

For a WP installation, I’d like to grant the MySQL user only the database privileges actually required to run WordPress.

So instead of using:
grant all on wpdb.* … etc
I want to use:
grant [only required priv_types] on wpdb.*

Are the minimum priv_type requirements documented anywhere? I have searched, but can’t find. I understand some plugins may have special requirements, however figure the core WP 2.1 must have a core set of minimum requirements. Core priv_types such as select, insert etc are fine, its the less obvious ones such as reload or execute that would be worth knowing whether they are required.

Version: MySQL 4.1.20