By Scott W. Ambler

* Describes Agile Modeling pushed layout (AMDD) and Test-Driven layout (TDD) techniques, database refactoring, database encapsulation options, and instruments that help evolutionary thoughts* Agile software program builders frequently use item and relational database (RDB) know-how jointly and for this reason needs to conquer the impedance mismatch* the writer covers suggestions for mapping items to RDBs and for enforcing concurrency keep watch over, referential integrity, shared enterprise common sense, safeguard entry regulate, reviews, and XML* An agile origin describes primary talents that each one agile software program builders require, relatively Agile DBAs* comprises item modeling, UML info modeling, information normalization, category normalization, and the way to house legacy databases* Scott W. Ambler is writer of Agile Modeling (0471202827), a contributing editor with software program improvement (www.sdmagazine.com), and a featured speaker at software program meetings world wide

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6: Stereotypes for Modeling Keys STEREOTYPE <> DIAGRAM CORE TYPE NOTATION Physical No APPLICATION Indicates that a column is part of an alternate key, also known as a secondary key, for a table. <> Indicates that the column value is automatically generated by the database. <> Conceptual, Yes Logical Indicates that an attribute is part of a candidate key for an entity. <> Physical Yes Indicates that a column is part of a foreign key to another table. <> All No Indicates that an attribute or column is part of a natural key.

This is because the goals for each diagram are different — you can use an LDM to explore domain concepts with your stakeholders and the PDM to define your database design. 2 a simple PDM, both modeling the concept of customers and addresses as well as the relationship between them. 4. The LDM depicts the two business entities, in this case Customer and Address, their logical attributes, and the relationship between the two entities. Notice how implementation details are not shown. The PDM shows greater detail than the LDM, including an associative table required to implement the association as well as the keys needed to maintain the relationships.

IEmployee3, like IEmployee1, is dependent on a single column, in this case Social_Security_Number. Tip Don’t model indices. The existence of an index is implied by the fact that you have indicated the primary key column(s) and any alternate key columns — in relational databases keys are implemented via indices. By also modeling the indices you unnecessarily clutter your diagrams. 4: Stereotypes for Classes STEREOTYPE DIAGRAM CORE TYPE NOTATIO APPLICATION N <> Physical No Apply this to aggregate tables used to store denormalized data (often for reporting purposes).

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