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21 Database - Definedatabase,entity,attribute,record...

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Define database, entity, attribute, record,  primary key and foreign key. Understand the advantages of using  databases. Know when to implement a database.
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Web Crawler  Indexer Query Processor
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Finds pages on the web and gives full text of  pages to Indexer Extracts links from new pages for subsequent  crawling
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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
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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 term’s appearance  on the page
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From: googleguide.com/google_works.html
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Keep track of data with multiple themes.
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Collections  of records Related tables Metadata
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