About Data Design
- Data design is basically the model of data that is represented at the high level of abstraction.
- The data design is then progressively refined to create implementation specific representations.
- Various Elements of Data Design are
- Data Object
The data objects are identified and relationship among various data objects can be represented using entity relationship diagrams or data dictionaries.
- Databases
Using Software Design model, the data models are translated into data structures and databases at the application level.
- Data Warehouses
At the business level useful information is identified from various databases and the data Warehouses are created. For extracting or navigating the useful business information stored in the huge data warehouse then data mining techniques are applied.
Guideline for Data Design
- Apply systematic analysis on data
Represent data objects, relationships among them and data flow along with the contents.
- Identify Data Structures and related operations
For the design of efficient data structures all the operations that will be performed on it should be
considered.
- Establish Data Dictionary
The data dictionary explicitly represents various data objects, relationships among them and the constraints on the elements of data structures.
- Defer the low-level design decisions until late in the design process.
Major structural attributes are designed first to establish an architecture of data. And then low-level design attributes are established.
- Use information hiding in the design of data structures.
The use of information hiding helps in improving quality of software design. It also helps in separating the logical and physical views.
- Apply a library of useful data structures and operations.
The data structures can be designed for reusability. A use of library of data structure templates (called as abstract data types) reduces the specification and design efforts for data.
- Use of software design and programming language to support data specification and
abstraction.
The implementation of data structures can be done by effective software design and by choosing suitable programming language.
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