Data Modeling Fundamentals: A Practical Guide for IT by Paulraj Ponniah

By Paulraj Ponniah

This can be a should have booklet facts Modeler probably want to continue for a protracted time.
It discusses each point of the knowledge Modeling discipline.

Does no longer subject what DBMS you utilize the knowledge during this publication is priceless.

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Because the data system is a precious asset, each organization develops the data system with utmost care utilizing the best available resources. The design and development of the data system must be substantially significant. If so, how should an organization go about establishing its data system? The organization needs to do sufficient planning for the data 30 CHAPTER 1 DATA MODELING: AN OVERVIEW system project. The development of a data system calls for a coordinated systematic approach with distinct and purposeful phases.

Requirements Definition. Business analysts and data analysts review the various business processes and study the information requirements to support the processes. The study would include one-on-one and group interviews with the users. Existing documentation must be reviewed. The analysts would watch and analyze how each business process is performed and what data is generated or used in each process. Requirement definition comprises the following major tasks: . . . . Study overall business operations Observe business processes Understand business needs Interview users Determine information requirements Identify data to be collected and stored Establish data access patterns Estimate data volumes DATA SYSTEM DEVELOPMENT 31 When the requirements definition gets completed, an appropriate definition document will be issued.

After some of the data completes its usefulness, the corresponding data elements get deleted from the database system. Figure 1-4 presents the stages in the data life cycle of an organization and also the interaction with the data model at the different stages. Now let us walk through the various stages of the data life cycle. At each stage, we will note how a data model is helpful and serves useful purposes. Needing Data. In this earliest stage, an organization recognizes the need for data for performing the various business processes.

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