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FIGURE 28 Design Skills Used in Database Development
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Tools of D a l a b a s e Development
To improve productivity in developing information systems, computer-aided software engineering (CASE) tools have been created CASE tools can help improve the productiv ity of information systems professionals working on large projects as well as end users working on small projects A number of studies have provided evidence that CASE tools facilitate improvements in the early phases of systems development leading to lower cost, higher quality, and faster implementations Most CASE tools support the database development process Some CASE tools support database development as a part of information systems development Other CASE tools target various phases of database development without supporting other aspects of infor mation systems development CASE tools often are classified as front-end and back-end tools Front-end CASE tools can help designers diagram, analyze, and document models used in the database develop ment process Back-end CASE tools create prototypes and generate code that can be used to cross-check a database with other components of an information system This section discusses the functions of CASE tools in more detail and demonstrates a commercial CASE tool, Microsoft Office Visio Professional 2003
Introduction to Database Development
Diagramming is the most important and widely used function in CASE tools Most CASE tools provide predefined shapes and connections among the shapes The connection tools typically allow shapes to be moved while remaining connected as though "glued" This glue feature provides important flexibility because symbols on a diagram typically are rearranged many times For large drawings, CASE tools provide several features Most CASE tools allow dia grams to span multiple pages Multiple-page drawings can be printed so that the pages can be pasted together to make a wall display Layout can be difficult for large drawings Some CASE tools try to improve the visual appeal of a diagram by performing automatic layout The automatic layout feature may minimize the number of crossing connections in a dia gram Although automated layout is not typically sufficient by itself, a designer can use it as a first step to improve the visual appearance of a large diagram
Documentation is one of the oldest and most valuable functions of CASE tools CASE tools can store various properties of a data model and link the properties to symbols on the diagram Example properties stored in a CASE tool include alias names, integrity rules, data types, and owners In addition to properties, CASE tools can store text describing assumptions, alternatives, and notes Both the properties and text are stored in the data dictionary, the database of the CASE tool The data dictionary is also known as the repository or encyclopedia To support system evolution, many CASE tools can document versions A version is a group of changes and enhancements to a system that is released together Because of the volume of changes, groups of changes rather than individual changes are typically released together In the life of an information system, many versions can be made To aid in under standing relationships between versions, many CASE tools support documentation for individual changes and entire versions
CASE tools can provide active assistance to database designers through analysis functions In documentation and diagramming, CASE tools help designers become more proficient In analysis functions, CASE tools can perform the work of a database designer An analysis function is any form of reasoning applied to specifications produced in the database development process For example, an important analysis function is to convert between an ERD and a table design Converting from an ERD to a table design is known as forward engineering and converting in the reverse direction is known as reverse engineering Analysis functions can be provided in each phase of database development In the conceptual data modeling phase, analysis functions can reveal conflicts in an ERD In the logical database design phase, conversion and normalization are common analysis func tions Conversion produces a table design from an ERD Normalization removes redun dancy in a table design In the distributed database design and physical database design phases, analysis functions can suggest decisions about data location and index selection In addition, analysis functions for version control can cross database development phases Analysis functions can convert between versions and show a list of differences between versions Because analysis functions are advanced features in CASE tools, availability of analysis functions varies widely Some CASE tools support little or no analysis functions while others support extensive analysis functions Because analysis functions can be useful in each phase of database development, no single CASE tool provides a complete range of
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