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The crawler was integrated with the indexing process, because text parsing was done for full-text indexing and also for URL extraction. There is a URL server that sends lists of URLs to be fetched by several crawling processes. During parsing, the URLs found were passed to a URL server that checked if the URL have been previously seen.
The crawl frontier contains the logic and policies that a crawler follows when visiting websites. This activity is known as crawling . The policies can include such things as which pages should be visited next, the priorities for each page to be searched, and how often the page is to be visited.
Crawler-based search engines are those that use automated software agents (called crawlers) that visit a Web site, read the information on the actual site, read the site's meta tags and also follow the links that the site connects to performing indexing on all linked Web sites as well. The crawler returns all that information back to a central ...
Videos. Video search results are videos that are sorted by relevance of the video in the descending order. A number of factors are considered when determining whether a video is relevant to your search request. Since these methods are not entirely foolproof, it is possible some inappropriate videos may be included in the list that you see. Maps
For example, the results page behind a web form can lie in the Deep Web if crawlers cannot follow a link to the results page. Crawler traps (e.g., calendars) may cause a crawler to download an infinite number of pages, so crawlers are usually configured to limit the number of dynamic pages they crawl.
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With this type of policy, there is a fixed rule stated from the beginning of the crawl that defines how to assign new URLs to the crawlers. For static assignment, a hashing function can be used to transform URLs (or, even better, complete website names) into a number that corresponds to the index of the corresponding crawling process. [4]