When the data flow from the warehouse it is considered as data reading and when data flows to the warehouse it is called data entry or data updation. The data warehouse can be viewed independent of its implementation.
The warehouse is simply not restricted to being a data file rather it can be anything like a folder with documents, an optical disc, a filing cabinet. Two horizontal lines represent the symbol of the store. The data is stored in the warehouse for later use. The direction of flow is represented by the arrow which can also be bi-directional. A given flow should only transfer a single type of information. Material shifts are modeled in systems that are not merely informative. Data flow also represents material along with information that is being moved. A relatable name should be given to the flow to determine the information which is being moved. The arrow symbol is the symbol of data flow. The process is named a short sentence, in one word or a phrase to express its essenceĭata flow describes the information transferring between different parts of the systems. The symbols of a process are rectangular with rounded corners, oval, rectangle or a circle. Input to output transformation in a system takes place because of process function. Data Flow diagrams are very popular because they help us to visualize the major steps and data involved in software-system processes. The DFD belongs to structured-analysis modeling tools. Data Flow Diagram can be represented in several ways. Specific operations depending on the type of data can be explained by a flowchart. DFD does not have control flow and no loops or decision rules are present. It also gives insight into the inputs and outputs of each entity and the process itself. The flow of data of a system or a process is represented by DFD.
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