Database design for smarties : using UML for data modeling by Robert J. Muller

By Robert J. Muller

Whether construction a relational, object-relational, or object-oriented database, database builders are more and more hoping on an object-oriented layout procedure because the top solution to meet consumer wishes and function standards. This booklet teaches you the way to take advantage of the Unified Modeling Language-the reliable usual of the thing administration Group-to improve and enforce the absolute best layout on your database.

Inside, the writer leads you step-by-step throughout the layout procedure, from specifications research to schema new release. you are going to discover ways to convey stakeholder wishes in UML use instances and actor diagrams, to translate UML entities into database elements, and to rework the ensuing layout into relational, object-relational, and object-oriented schemas for all significant DBMS items.

* Teaches you every thing you must comprehend to layout, construct, and attempt databases utilizing an OO model.
* indicates you the way to take advantage of UML, the authorized average for database layout in keeping with OO principles.
* Explains find out how to remodel your layout right into a conceptual schema for relational, object-relational, and object-oriented DBMSs.
* bargains useful examples of layout for Oracle, SQL Server, Sybase, Informix, item layout, POET, and different database administration systems.
* Focuses seriously on re-using layout styles for optimum productiveness and teaches you ways to certify accomplished designs for re-use.

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Unless you enjoy the back-and-forth of angry users and programmers, however, your goal in gathering requirements is to reduce ambiguity to the point where you can deliver a useful database design that does what people want. As an example, consider the commonplace book. This was a collection of reference materials that Sherlock Holmes constructed to supplement his prodigious memory for facts. Some of the relevant Holmes quotations illustrate the basic requirements. This passage summarizes the nature of the commonplace book: "Kindly look her up in my index, Doctor," murmured Holmes without opening his eyes.

You create ambiguity when you state the requirements for your system or database that someone might interpret in different ways. Gause and Weinberg cite three specific kinds of ambiguity that are important for requirements gathering [Gause and Weinberg 1989]: ƒ Missing Requirements: Needs that are a key part of resolving the differences in interpretation ƒ Ambiguous words: Words in the requirement that are capable of multiple interpretations - 41 - ƒ Introduced elements: Words you put in the mouth of the stakeholder In designing the commonplace book system, we have perhaps a bit less access to Holmes than we would ordinarily like, given his busy schedule and general terseness.

Informix Dynamic Server also provides BLOBs and - 35 - CLOBs. DB2 V2 provides BLOBs, CLOBs, and DBCLOBs (binary, single-byte, and multibyte characters, respectively). V2 also provides file references to let you read and write LOBs from and to files. Inheritance Inheritance in OR systems comes with a couple of twists compared to the inheritance in OODBMSs. The first twist is a negative one: Oracle8 and DB2 V2 do not support any kind of inheritance. Oracle8 may acquire some form of inheritance in future releases, but the first release has none.

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