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Is database a secondary actor?
The database system is a secondary actor because the application initiates the interaction by sending an SQL query.
Can a database be an actor in a use case diagram?
2 Answers. No, databases should not be included in a Use Case Diagram of an isolated system. Databases are a static internal part of a system and do not directly take part without a front interface (i.e. your system itself).
Can a use case have no actors?
3 Answers. Officially this is correct. An included use case is a mandatory part of the including use case and an extending use case will optionally extend some use case.
What is primary and secondary actor in a use case with example?
Primary actors initiate a use case and hence are somewhat independent. Secondary actors, on the other hand, are used by the system but they do not interact with the system on their own. In other words, secondary actors do not initiate any use case. For example, an actor may represent a customer of a bank.
Can the actor be the system?
Actors can be people, other systems, time triggers, or event triggers. An actor specifies a role played by a user or any other system that interacts with the subject. It may represent roles played by human users, external hardware, or other subjects.
Why is the database system a secondary actor?
The database system is a secondary actor because the application initiates the interaction by sending an SQL query. Once you have identified your actors and their goals, you have now created your initial list of high-level use cases.
Why is the database system a secondary Acto R?
The user is a primary acto r because he initiates the interaction with the system (application). The database system is a secondary actor because the application initiates the interaction by sending an SQL query. Once you have identified your actors and their goals, you have now created your initial list of high-level use cases.
Which is the primary actor in a use case?
We know that the primary actor is the one that initiates a use case and a secondary actor is the one that helps completion of the use case through his specific support. The Primary actor is usually placed at the left side to the boundary of the system and the secondary actor is placed to the right of the boundary of the system.
Why are primary and secondary actors used in UML?
Because in some use cases he is a primary actor and secondary actor in others . Placing primary actors left and secondary actors right is just a convention to facilitate the reading of the diagram by people who know that convention. This is not part of the UML standard, so you can do as you want.