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one that libraries use, and, when it displays a particular document, it can also display a brief description of documents that are close in the hierarchy In an information retrieval system, there is no need to keep a document in a single spot in the hierarchy A document that talks of mathematics for computer scientists could be classi ed under mathematics as well as under computer science All that is stored at each spot is an identi er of the document (that is, a pointer to the document), and it is easy to fetch the contents of the document by using the identi er As a result of this exibility, not only can a document be classi ed under two locations, but also a subarea in the classi cation hierarchy can itself occur under two areas The class of graph algorithm document can appear both under mathematics and under computer science Thus, the classi cation hierarchy is now a directed acyclic graph (DAG), as shown in Figure 2211 A graph-algorithm document may appear in a single location in the DAG, but can be reached via multiple paths A directory is simply a classi cation DAG structure Each leaf of the directory stores links to documents on the topic represented by the leaf Internal nodes may also contain links, for example to documents that cannot be classi ed under any of the child nodes To nd information on a topic, a user would start at the root of the directory and follow paths down the DAG until reaching a node representing the desired topic While browsing down the directory, the user can nd not only documents on the topic he is interested in, but also nd related documents and related classes in the classi cation hierarchy The user may learn new information by browsing through documents (or subclasses) within the related classes Organizing the enormous amount of information available on the Web into a directory structure is a daunting task.

Candidate key: a minimal superkey A superkey is minimal if removing any column makes it no longer unique

The McGraw Hill Companies, 2001

Regression testing is similar to functionality testing, except that regression testing addresses the performance and functionality of a new software version or a hardware upgrade New versions of software are supposed to fix old bugs, but they can also introduce new bugs that may be worse than the old ones Here are some events that might warrant regression testing: A new Cisco IOS release A new Microsoft NT Service Pack A new Web-browser Client A new version of an in-house application

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Null value: a special value that represents the absence of an actual value A null value can mean that the actual value is unknown or does not apply to the given row Primary key: a specially designated candidate key The primary key for a table cannot contain null values Foreign key: a column or combination of columns in which the values must match those of a candidate key A foreign key must have the same data type as its associated candi date key In the CREATE TABLE statement of SQL, a foreign key must be associated with a primary key rather than merely a candidate key Rules

The rst problem is determining what exactly the directory hierarchy should be The second problem is, given a document, deciding which nodes of the directory are categories relevant to the document To tackle the rst problem, portals such as Yahoo have teams of internet librarians who come up with the classi cation hierarchy and continually re ne it The Open Directory Project is a large collaborative effort, with different volunteers being responsible for organizing different branches of the directory The second problem can also be tackled manually by librarians, or Web site maintainers may be responsible for deciding where their sites should lie in the hierarchy There are also techniques for automatically deciding the location of documents based on computing their similarity to documents that have already been classi ed

Acceptance testing checks to make sure everything is working as planned before a new application or hardware solution is rolled out into production This is why acceptance testing is often the last type of testing performed Outside contractors or consultants often provide a Service Level Agreement (SLA) that guarantees a certain level of throughput or other measure of quality You will want to test your network to make sure these levels of quality are met

226 Summary

Decision-support systems analyze online data collected by transactionprocessing systems, to help people make business decisions Since most organizations are extensively computerized today, a very large body of information is available for decision support Decision-support systems come in various forms, including OLAP systems and data mining systems Online analytical processing (OLAP) tools help analysts view data summarized in different ways, so that they can gain insight into the functioning of an organization

Entity integrity rule: No two rows of a table can contain the same value for the primary key In addition, no row can contain a null value for any column of a primary key Referential integrity rule: Only two kinds of values can be stored in a foreign key: a value matching a candidate key value in some row of the table containing the asso ciated candidate key or a null value

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