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Data Flow Diagram Level1

Delidumrul
Delidumrul asked
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Last Modified: 2013-11-29
Hi All,

I am working on the database assignment. I completed the context diagram. At the moment, I am trying to draw data flow diagram level1. I must define external entities, process and data store. I finished external entities. However, I do not know how to identify process and data store. Does anyone has idea about it?
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Commented:
I uploaded the picture of context diagram. This could help you understand the question easier.
contextupdated.png

Commented:
The use of DFD's are to simplify the process of designing a database system.  So the thing to do is try to not think too deeply about it.  Your context diagram is too complex and almost a level 1 DFD.

Your datastore would be the 'Rental System Database'  This will be linked to the process 'DVD Rental system'.  If the system is for a local store, you'll only have the one datastore.  Although you can represent the same datastore numerous times on a diagram to keep it clean and tidy.

Your processes for a level 1 DFD would be:  

'Search Customer details''
'Save customer details to datastore (Rental System Database)
'Update customer details'
'Update DVD's issued'
Update DVD's returned'
'Review stock levels'

Hope this helps.  Remember a DFD is a tool to help you design, not to confuse you :-)

Author

Commented:
Thanks for reply,

I updated the DFD1. How it looks?


dfd1.png

Commented:
Looks like you're almost there.  You've numbered everything well and used the correct templates.  When a member uses a terminal to search it queries the data store so you'll need to add the data store next to that process also.

Author

Commented:
What kind of data stores is required for this project?

Author

Commented:
When we look at the context diagram, there are 5 data flows from Shop assistant to the system such as renewal of DVD, return of DVD, Member details and so on. Do you think I should create data store for each data flow?

Author

Commented:
It is the updated version. I need some feedbacks.


dfd1.png
Commented:
This one is on us!
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Author

Commented:
Hello Vee_Mod,

I have been still working on this project. Therefore, I will have some other questions about it.

Thanks,

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