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Part One Introduction to Database Environments
FIGURE 210 Template and Canvas Windows in Visio Professional
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FIGURE 211 Database Properties Window in Visio Professional for the Product Entity Type
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FIGURE 212 Database Properties Window in Visio Professional for the Places Relationship
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referential action as shown in Figure 212 For additional data dictionary support, custom properties and properties specific to a DBMS can be added Visio provides several analysis and prototyping tools beyond its template and data dictionary features The analysis tools primarily support the schema conversion task in the logical database design phase The Refresh Model Wizard detects and resolves differences
2
Introduction to Database Development
between a Visio database diagram and an existing relational database The Reverse Engineer Wizard performs the reverse task of converting a relational database definition into a Visio database diagram Visio also supports various error checks to ensure consistent database diagrams For prototyping, Visio can store shapes in relational databases This feature can be particularly useful for providing a visual interface for hierarchical data such as organization charts and bill of material data For more powerful prototyping, Visio supports the Visual Basic with Applications (VBA) language, an event-driven language integrated with Microsoft Office
Closing Thoughts
This chapter initially described the role of databases in information systems and the nature f database development process Information systems are collections of related components that produce data for decision making Databases provide the permanent memory for information systems Development of an information system involves a repetitive process of analysis, design, and implementation Database development occurs in all phases of systems development Because a database is often a crucial part of an information system, database development can be the dominant part of information systems development Development of the processing and environment interaction components are often performed after the database development Cross-checking between the database and applications is the link that connects the database development process to the information systems development process After presenting the role of databases and the nature of database development, this chap ter described the goals, phases, and tools of database development The goals emphasize both the information content of the database as well as efficient implementation The phases of database development first establish the information content of the database and then find an efficient implementation The conceptual data modeling and logical database design phases involve the information content of the database The distributed database de sign and physical database design phases involve efficient implementation Because devel oping databases can be a challenging process, computer-aided software engineering (CASE) tools have been created to improve productivity CASE tools can be essential in helping the database designer to draw, document, and prototype the database In addition, some CASE tools provide active assistance with analyzing a database design This chapter provides a context for the chapters in Parts 3 and 4 You might want to reread this chapter after completing the chapters in Parts 3 and 4 The chapters in Parts 3 and 4 provide details about the phases of database development s 5 and 6 present details of the Entity Relationship Model, data modeling practice using the Entity Relation ship Model, and conversion from the Entity Relationship Model to the Relational Model 7 presents normalization techniques for relational tables 8 presents physical database design techniques
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