Материал из База данных ДЮО "Остров Сокровищ"
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| − | Search engines have a tiny make an inventory of significant operations that allows them to impart significant web results when searchers use their system to attain information.
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| − | 1. Crawling the Web
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| − | Search engines run automated programs, called "bots" before "spiders" that manipulate the hyperlink structure of the web to "crawl" the pages and documents that compose up the World Spacious Web. Estimates are that of the approximately 20 billion open pages, exploration engines have crawled between 8 and 10 billion.
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| − | 2. Indexing Documents
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| − | Once a page has been crawled, it's contents can live "indexed" - stored in a giant folder of documents that makes up a search engine's "index" This index requirements to ensue tightly managed, accordingly that requests which essential explore and sort billions of documents can be present concluded in fractions of a second.
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| − | 3. Processing Queries
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| − | When a request on behalf of information comes into the search engine (hundreds of millions perform each one day), the engine retrieves from its index all the document that match the query. A match is firm condition the terms or phrase is found taking place the page in the manner precise by the user. In support of example, a explore for car and driver magazine on Google returns 8.25 million fallout, on the contrary a explore in support of the same idiom in quotation marks ("car and driver magazine") returns only 166 thousand fallout. In the earliest system, normally called "Findall" mode, Google returned all ID which had the terms "car" "driver" and "magazine" (they ignore the term "and" because it's not beneficial to narrowing the results), at the same time as in the subsequent seek out, only those pages with the strict verbalize "car and driver magazine" were returned. Supplementary sophisticated operators (Google has a list of 11) can adjustment which results a explore engine will care about a match in support of a known query.
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| − | 4. Ranking Results
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| − | Once the explore engine has strong-minded which results are a match for the query, the engine's algorithm (a numerical equation normally old for sorting) runs calculations by apiece of the results to verify which is most important to the known query. They sort these by the results pages in order commencing mainly germane to least thus that users can bring in a choice concerning which to select.
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| − | Although a search engine's operations are not chiefly lengthy, systems like Google, Yahoo!, AskJeeves and MSN are among the most complicated, processing-intensive computers in the world, running millions of calculations apiece second and funneling demands for information to an enormous grouping of users. Read more for SEO: [http://www.pozycjonowanie-torun.net Pozycjonowanie Bydgoszcz]
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Текущая версия на 21:09, 14 ноября 2013
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