PATTERNS OF DATA MODELING- P16 pps

... chief information officer may report to both the chief operating officer and chief financial officer. The model can store the current reporting structure, report- ing structures of the past, and ... unimportant and the history of a directed graph must be recorded. • Node and edge directed graph changing over time. Use when there is data for edges and the history of a directed graph mu...

Ngày tải lên: 05/07/2014, 06:20

... time. Records the history of a tree. This template permits storing of the past, present, and future content of trees. • Degenerate node and edge. Use when there is data for the parent–child grouping. Table ... tree. References [Fowler-1997] Martin Fowler. Analysis Patterns: Reusable Object Models. Boston, Massachusetts: Addison-Wesley, 1997. Figure 2.46 Excerpt of data model for...

Ngày tải lên: 05/07/2014, 06:20

... Template Bibliographic Notes Page 89 of [Hay-1996] has an example of projects that involve the node and edge directed graph. References [Hay-1996] David C. Hay. Data Model Patterns: Conventions of Thought. New York, ... An undirected graph is a set of nodes and a set of edges. Each edge connects two nodes (which may be the same). The nodes of an undirected graph can have any nu...

Ngày tải lên: 05/07/2014, 06:20

... various combinations of dimensions. (Section 6.1.5 discusses the store sales example.) Such queries can involve massive amounts of data, so performance is always a concern. Data warehouses use ... subset of data for store sales and is covered further in the next section. In practice there are a modest number of dimension re- cords (tens or hundreds per table) and a large number...

Ngày tải lên: 05/07/2014, 06:20

... characterization of a common software flaw. As you construct models, you should be alert for antipatterns and correct them. Table 8.1 summarizes universal anti- patterns antipatterns to always ... 8.1 Summary of Universal Antipatterns 110 Chapter 8 / Universal Antipatterns for improving software quality. [Laplante-2006] builds on [Brown-1998] and adds further management antipatterns as ....

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... the owner as well as money in lieu of partial shares. A computing transaction (often involving a database) is a group of commands that is treated as a unit of work. All commands must be completed ... 10.2). Ven- dors often have special data to collect, such as supply data, credit information, and order lead time. You could use softcoding (see Chapter 13) to capture vendor data, but...

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... nuances of patterns. Chapter 16 elaborates this use of two modeling notations and presents an overview of my approach to the database design process. I begin constructing a model with the UML data structure ... VI Relational Database Design Chapter 16 Relational Database Design 205 This book is about patterns and patterns are described via models. I have presented two no- tation...

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... accumulating the history of past data. A data warehouse puts data in one database and stores data in a common format for reporting purposes. database a permanent, self-descriptive store of data that is contained ... the identity of occurrences of a critical concept and unifies its data across an organization’s applications. mathematical template See template. metadata data...

Ngày tải lên: 05/07/2014, 06:20

Ngày tải lên: 05/07/2014, 06:20

... Modeling Notation 1 1.3 What Is a Pattern? 2 1.4 Why Are Patterns Important? 3 1.5 Drawbacks of Patterns 4 1.6 Pattern vs. Seed Model 4 1.7 Aspects of Pattern Technology 5 1.8 Chapter Summary 6 Bibliographic ... Summary 89 Bibliographic Notes 89 References 90 Chapter 7 Summary of Templates 91 Part II: Antipatterns 95 Chapter 8 Universal Antipatterns 97 8.1 Symmetric Relationship Ant...

Ngày tải lên: 05/07/2014, 06:20