The actors are those who will perform some work in the project like Admin is the actor and user is the actor user sends request for registration to the admin and he confirm him the data stored in some place which is not counted as actor.
Every dbms that we use now-a-dayz, usually are not just a storage containers, but we query them, orelse perform
tasks and operations. even if we wanna get some result, we query them from
business logic directly or use some stored procedure elseway.
consider it that way, where database can be
considered as an actor, as it should be.