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Entity integrity means that each table must have a column or combination of columns with unique values Unique means that no two rows of a table have the same value For exam ple, StdSSN in Student is unique and the combination of StdSSN and OfferNo is unique in Enrollment Entity integrity ensures that entities (people, things, and events) are uniquely identified in a database For auditing, security, and communication reasons, it is important that business entities be easily traceable Referential integrity means that the column values in one table must match column values in a related table For example, the value of StdSSN in each row of the Enrollment table must match the value of StdSSN in some row of the Student table Referential integrity ensures that a database contains valid connections For example, it is critical that each row of the Enrollment table contains a Social Security number of a valid student Otherwise, some enrollments can be meaningless, possibly resulting in students denied enrollment because nonexisting students took their places For more precise definitions of entity integrity and referential integrity, some other defini tions are necessary These prerequisite definitions and the more precise definitions follow Definitions Superkey: a column or combination of columns containing unique values for each row The combination of every column in a table is always a superkey because rows in a table must be unique

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To support very high query rates, the indices may be kept in main memory, and there are multiple machines; the system selectively routes queries to the machines to balance the load among them

servers or otherwise tax the application Often, an application will eventually succumb to an increasing load Ideally, you should know the limitations of every piece of hardware and software in your network In a Microsoft/Cisco network, the most likely piece to fail is an application or a data circuit It's not usually the hardware Cisco hardware is extraordinarily reliable (although nothing can achieve 100% reliability)

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A typical library user may use a catalog to locate a book for which she is looking When she retrieves the book from the shelf, however, she is likely to browse through other books that are located nearby Libraries organize books in such a way that related books are kept close together Hence, a book that is physically near the desired book may be of interest as well, making it worthwhile for users to browse through such books To keep related books close together, libraries use a classi cation hierarchy Books on science are classi ed together Within this set of books, there is a ner classi cation, with computer-science books organized together, mathematics books organized together, and so on Since there is a relation between mathematics and computer science, relevant sets of books are stored close to each other physically At yet another level in the classi cation hierarchy, computer-science books are broken down into subareas, such as operating systems, languages, and algorithms Figure 2210 illustrates a classi cation hierarchy that may be used by a library Because books can be kept at only one place, each book in a library is classi ed into exactly one spot in the classi cation hierarchy In an information retrieval system, there is no need to store related documents close together However, such systems need to organize documents logically so as to permit browsing Thus, such a system could use a classi cation hierarchy similar to

Entity integrity is also known as uniqueness integrity The uniqueness of rows is a feature of the relational model that SQL does not require

The McGraw Hill Companies, 2001

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Functionality testing verifies that all the features of an application perform as desired A product vendor's claims are sometimes not supported in every network You will want to run the application in a test environment that is as close to your production environment as possible, to emulate the same load and traffic the application will encounter once it is put into service

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