21 Database - Define database, entity, attribute, record,...

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Unformatted text preview: Define database, entity, attribute, record, primary key and foreign key. Understand the advantages of using databases. Know when to implement a database. Web Crawler Indexer Query Processor Finds pages on the web and gives full text of pages to Indexer Extracts links from new pages for subsequent crawling Each significant word in page is extracted and indexed Results stored in tables: Search term URL of page containing term Location of term on page Number of times term appears on page Number of pages that link to this URL User Interface allows you to identify search criteria Engine matches search criteria to index of terms previously stored Results Formatter displays URLs containing search terms displayed in order by a ranking that is based on other data stored about the terms appearance on the page From: googleguide.com/google_works.html Keep track of data with multiple themes.Keep track of data with multiple themes....
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This note was uploaded on 11/21/2011 for the course ACIS 1504 taught by Professor Jmlacoste during the Fall '07 term at Virginia Tech.

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21 Database - Define database, entity, attribute, record,...

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