HRM 3450 Chapter Notes - Chapter 17: Web Server, Web Browser
5 May 2018
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HRM 3450 Chapter 17 Notes – Summary
Introduction
• The ad heker searhes for ords i the adertisig dataase that ath the users
request and adds the corresponding advertisement(s) to the material that will be used
to create the response page.
• The index servers look up each word from the request in the index database and
compile a list of matching pages for each word.
• The list is then adjusted for multiple words and phrases and sorted in order of
releae, ased o Googles rakig algoriths.
• This list is then passed back to the Web server.
• Next, the Web server calls upon the document servers to look up each matching page in
the Web page database.
• The document servers return a URL, a title, and a short snippet of text for each
document to the Web server.
• Finally, the Web server creates an HTML document from the spelling, ad, and matching
page results ad returs the page to the users We roser.
• Although the application processing just described is relatively straightforward
• The implementation of this system presented a number of challenges to the system
architects, the index and document databases are both massive in size.
• Ma searhes ill result i a large uer of hits; eah hit ust e ealuated ad
ranked.
• Each hit requires retrieval and processing of a separate page from the document
database.
• All of this processing must occur very quickly.
• And the numbers of searches occurring simultaneously may also be extremely large.
• Googles sste arhitets respoded to these hallenges by recognizing that each
search could be processed independently on a separate computer, except for certain
bottlenecks.
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