Database Modeling and Design, Third Edition by Toby J. Teorey

By Toby J. Teorey

This re-creation of Database Modeling & layout maintains to target the strategies for relational database layout brought in prior variants, beginning with the entity-relationship (ER) procedure for info standards specification and conceptual modeling. writer Toby Teorey then seems forward to the typical homes in info modeling and operations shared one of the relational version and complicated database applied sciences equivalent to the object-oriented, temporal, and multimedia versions. an entire bankruptcy is dedicated to database layout options for info warehousing and on-line analytical processing (OLAP).

Teorey covers the database existence cycle from necessities research and logical layout to actual layout for neighborhood, dispensed, and multidatabases. The dialogue of uncomplicated ideas is supplemented with a standard, operating instance: an organization body of workers and venture database in keeping with real-life reports and school room checking out.

Written for either the amateur and the pro database clothier, this booklet is the basic source for database modeling, together with the construction of ordinary SQL information definitions. The layout principles set forth during this ebook are acceptable to any SQL-based process, together with IBM DB2, Oracle V8.0, Informix IDS-UDO, Microsoft entry, Microsoft SQL Server, and Sybase Adaptive Server firm. * persisted concentrate on relational version * Integration of data approximately info warehouse and OLAP, plus different complicated database applied sciences, together with item orientated, multimedia, and temporal database * dialogue of easy rules is supplemented by way of examples in keeping with actual existence circumstances

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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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