The process that operate our data in our database usually transfer data between processes. We can determine which data flowing in processes by Using dataflow diagram.
When we need to create database operation application such as Web application,Shop inventory system etc, we need to know what data those store in our database. The application will have to running processes to show and response us, each process have to transfer data between them. To determine which data flowing in each processes we have to drawing some diagram in our paper.
Dataflow diagram is very helpful to determine which data will flow in each process.It doesn't like flowchart beacause It certainty mentioned about data,we don't have to write a lot of conditions.It is one of necessary diagram to planing systems those will running on website,inventory,HR etc.It is guide to us which data will using in each process,which data will transfered between processes.
We can draw dataflow in following forms:
1.Yourdon + Demarco.
2.Gane and Sarson.
3.SSDAM
4.Unified
Concept of drawing :::the application or process is like closed box please open them.
In following step to determine data.
1. draw context diagram -- to determine which data will operated between user and application
2.draw Level 0....n dataflow diagram -- to uncover application and determine data in each processes,we can separate in small module to get easily understand.
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