Hologres is compatible with PostgreSQL 11, and the permission system is the same as PostgreSQL.
1.Superuser:the Hologres instance owner，who has all the authority ，for example, create 、drop database and create user ,etc.
2.Normal user:can connect Hologres after Authorized by instance superuser，and can do developing within the scope of authority .normal user can also be superuser.
3.User group: composited by 0 or more users , used to represent user roles, such as administrator role, developer role, etc., users in a user group have the same permissions.
more information ，please see PostgreSQL role.