Forum OpenACS Development: Re: OpenACS Permissions System - Performance Improvement Work

in general is suggested to use acs_object_party_privilege_map like this:
select 1 from dual
where exists
( select 1
from acs_object_party_privilege_map ppm
where ppm.object_id = :object_id and ppm.party_id = :party_id and ppm.privilege = :privilege

it should be enough to check any permission.