By Thomas M. Connolly, Carolyn E. Begg
This e-book areas a powerful emphasis on reliable layout perform, permitting readers to grasp layout method in an available, step by step style. during this publication, database layout technique is explicitly divided into 3 levels: conceptual, logical, and actual. each one part is defined in a separate bankruptcy with an instance of the technique operating in perform. large remedy of the net as an rising platform for database purposes is roofed along many code samples for gaining access to databases from the internet together with JDBC, SQLJ, ASP, ISP, and Oracle's PSP. a radical replace of later chapters overlaying object-oriented databases, net databases, XML, facts warehousing, info mining is incorporated during this re-creation. a transparent creation to layout implementation and administration concerns, in addition to an intensive therapy of database languages and criteria, make this booklet an fundamental, whole reference for database professionals.
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Additional info for Database Systems: A Practical Approach to Design, Implementation and Management (4th Edition)
Both these examples illustrate inconsistencies that may result from the duplication of data. As there is no automatic way for Personnel to update the data in the Payroll files, it is not difficult to foresee such inconsistencies arising. Even if Payroll is notified of the changes, it is possible that the data will be entered incorrectly. Data dependence As we have already mentioned, the physical structure and storage of the data files and records are defined in the application code. This means that changes to an existing structure are difficult to make.
Currently there is no standard notation for an ER model. Most books that cover database design for relational DBMSs tend to use one of two conventional notations: n Chen’s notation, consisting of rectangles representing entities and diamonds representing relationships, with lines linking the rectangles and diamonds; or n Crow’s Feet notation, again consisting of rectangles representing entities and lines between entities representing relationships, with a crow’s foot at one end of a line representing a one-to-many relationship.
The chapter also examines the security problems that can arise in a Web environment and presents some approaches to overcoming them. Chapter 20 concentrates on three functions that a Database Management System should provide, namely transaction management, concurrency control, and recovery. These functions are intended to ensure that the database is reliable and remains in a consistent state when multiple users are accessing the database and in the presence of failures of Preface both hardware and software components.