The materialized view permissions list displays details on the specific object permissions directly granted to users or roles for a single view.
Users or roles with object ownership or the MANAGE ANY OBJECT PRIVILEGE system privilege are automatically granted all possible object permissions with administrative rights.
The permissions list only lists those permissions granted directly to users or roles. The list indicates to whom the permissions are granted (grantee), by whom (grantor), and the permissions and their corresponding administrative rights. The permissions list does not list object permissions obtained through ownership, the MANAGE ANY SYSTEM OBJECT system privilege, or role membership.
All members of the role inherit permissions granted to a role, including administrative rights. The role, not the users indirectly granted the permissions through inheritance, appears on the permissions list.
The REVOKE command applies to the database object permission itself, not to any administrative right granted on the permission. Therefore, to remove the administrative right only and leave the database object permission intact, do not use the Revoke button. Rather, regrant the specific permission without administrative rights. Only the original grantor can remove the administrative rights only from a granted permission. If another grantor regrants the same permission without administrative rights, a new permission without administrative rights is granted, but the original permission with administrative rights remains and takes precedence over any other non-administrative grants of the same permission to the same user or role.
If multiple permissions are granted, you can revoke some or all of the permissions. However, if you revoke a permission granted administrative rights, and the grantee has granted the permission to other users, who in turn have granted it to other users, and so on, every grantee in the chain who has received the permission indirectly, with or without administrative rights, also has their permission revoked. For example, UserA is granted the SELECT permission with the With grant option. UserA grants SELECT to UserB with the With grant option. UserB grants SELECT to UserC and UserD without administrative rights and to UserE with administrative rights. When you revoke the SELECT permission from UserA, it is also revoked for UserB, UserC, UserD and UserE.
Permissions can be granted on the same view or materialized view, to the same grantee, by multiple grantors, resulting in the same grantee appearing multiple times on the list. If the same permission is granted to the same grantee, with and without administrative rights, the grant with the administrative right takes precedence.
When you revoke a permission granted multiple times, the permission is revoked from all instances, regardless of administrative rights. For example, Manager1 grants User2 INSERT with administrative rights. User1 also grants INSERT to User2, without administrative rights. Both instances of INSERT are revoked for User2, regardless of which instance of INSERT is revoked.