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How Search Engines Work: Crawling + Indexing
By David Tang


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A search engine operates, in the following order: 1) Crawling; 2) Deep Crawling Depth-first search (DFS); 3) Fresh Crawling Breadth-first search (BFS); 4) Indexing; 5) Searching.

Web search engines work by storing information about a large number of web pages, which they retrieve from the WWW itself. These pages are retrieved by a web crawler (also known as a spider) ? an automated web browser which follows every link it sees, exclusions can be made by the use of robots.txt. The contents of each page are then analyzed to determine how it should be indexed. Data about web pages is stored in an index database for use in laater queries. Some search engines, such as Google, store all or part of the source page (referred to as a cache) as well as information about the web pages, whereas some store every word of every page it finds, such as AltaVista. This cached page always holds the actual search text since it is the one that was actually indexed, so it can be very useful when the content of the current page has been updated and the search terms are no longer in it.

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Are you proud of the way that your web pages look or do they lack a certain web presence? Has the site looked the same for the best part of a decade and could you be found guilty of not moving with the times? You could be dong your company a massive injustice if the site is looking a tad stale. Yet with assistance from a Website Design Bristolteam you could be boosting your online presence. Working on your behalf the Website Design Bristolfirm can create a stunning new online experience for your clients that will captivate their attention. At the moment your existing web pages might be hard to navigate and they couldn`t be classed as user-friendly. The new site needs to make information readily available without clients having to trawl through any number of sections. A simple but effective solution can be offered but the Website Design Bristolfirm that will empower your clients with the ability to navigate your new site with ease. People clicking on the new web pages will have a greater understanding about you as a company along with the products and the services that you are offering to them. Be proud of your web pages; don`t hang your head in shame, by running an outdated web position.

Clive Roberts
Clive Roberts role
For more information, news and articles see:

Clive Roberts - Clive Roberts
...e Roberts role was to develop the invoice generation and notification for British Airways. Which used SQL2005 (tables, stored procedures, triggers); Reporting Services for the invoices; Notification s...
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Software Engineer - Software Engineer
...pment, support and management and particularly focuses on a methodical approach to the error-free design and building of software. A Software Engineer will developed software with formal methods, Anal...
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