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Organization And Data Processing

New PDF release: Database Solutions: A step by step guide to building

By Thomas M Connolly, Carolyn E Begg

ISBN-10: 0321173503

ISBN-13: 9780321173508

The second one variation of this publication accommodates relational database layout methodologies to educate readers how databases will be applied in Microsoft entry and Oracle. not just does the publication offer a complete technique for relational database layout, however the authors additionally express readers find out how to use the newest install of UML. Fifteen pattern database designs selected from seven universal enterprise components can be found in an Appendix, and an evaluate reproduction of Rational Rose software program is incorporated at the accompanying CD-ROM. Database designers eager to examine extra approximately relational database thought in addition to these simply eager to extend there basic database expertise wisdom.

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Extra resources for Database Solutions: A step by step guide to building databases

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One application server is designed to serve multiple clients. (3) A DBMS, which stores the data required by the middle tier. This tier may run on a separate server called the database server. The three-tier design has many advantages over the traditional two-tier design, such as: ■ A ‘thin’ client, which requires less expensive hardware. ■ Simplified application maintenance, as a result of centralizing the business logic for many end-users into a single application server. This eliminates the concerns of software distribution that are problematic in the traditional twotier client–server architecture.

Some disadvantages include complexity, cost, reduced performance, and higher impact of a failure. 1. 2 Discuss the meaning of each of the following terms: (a) (b) (c) (d) (e) (f) data; database; database management system; application program; data independence; views. 3 Describe the main characteristics of the database approach. 4 Describe the five components of the DBMS environment and discuss how they relate to each other. 5 Describe the problems with the traditional two-tier client–server architecture and discuss how these problems were overcome with the three-tier client–server architecture.

However, although there is only a single value of Tom Daniels in this table just now, a new member of staff with the same name could join the company, which would therefore prevent the choice of name as a candidate key. Primary key The candidate key that is selected to identify records uniquely within the table. Since a table has no duplicate records, it’s always possible to uniquely identify each record. This means that a table always has a primary key. In the worst case, the entire set of columns could serve as the primary key, but usually some smaller subset is sufficient to distinguish the records.

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Database Solutions: A step by step guide to building databases by Thomas M Connolly, Carolyn E Begg

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