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RulesThis is a discussion on Search Engine within the Information Technology forums, part of the Education & Learning category; No Google is not every thing there are plenty of meta search engines that uses google as part to search ...
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#1
11-21-2007, 04:37 PM
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No Google is not every thing there are plenty of meta search engines that uses google as part to search any keyword but first we have to understand the basic of a search engine as under; Search engine A search engine is an information retrieval system designed to help find information stored on a computer system. Search engines help to minimize the time required to find information and the amount of information which must be consulted, akin to other techniques for managing information overload. The most public, visible form of a search engine is a Web search engine which searches for information on the World Wide Web. How search engines work Search engines provide an interface to a group of items that enables users to specify criteria about an item of interest and have the engine find the matching items. The criteria are referred to as a search query. In the case of text search engines, the search query is typically expressed as a set of words that identify the desired concept that one or more documents may contain. There are several styles of search query syntax that vary in strictness. Where as some text search engines require users to enter two or three words separated by white space, other search engines may enable users to specify entire documents, pictures, sounds, and various forms of natural language. Some search engines apply improvements to search queries to increase the likelihood of providing a quality set of items through a process known as query expansion.  index-based search engine The list of items that meet the criteria specified by the query is typically sorted, or ranked, in some regard so as to place the most relevant items first. Ranking items by relevance (from highest to lowest) reduces the time required to find the desired information. Probabilistic search engines rank items based on measures of similarity and sometimes popularity or authority. Boolean search engines typically only return items which match exactly without regard to order. To provide a set of matching items quickly, a search engine will typically collect metadata about the group of items under consideration beforehand through a process referred to as indexing. The index typically requires a smaller amount of computer storage, and provides a basis for the search engine to calculate item relevance. The search engine may store of copy of each item in a cache so that users can see the state of the item at the time it was indexed or for archive purposes or to make repetitive processes work more efficiently and quickly. Notably, some search engines do not store an index. Crawler, or spider type search engines may collect and assess items at the time of the search query. Meta search engines simply reuse the index or results of one or more other search engines. Metasearch engine A meta-search engine is a search engine that sends user requests to several other search engines and/or databases and returns the results from each one. Metasearch engines enables users to enter search criteria once and access several search engines simultaneously. Since it is hard to catalogue the entire web, the idea is that by searching multiple search engines you are able to search more of the web in less time and do it with only one click. The term Metasearch is frequently used to classify a set of commercial search engines, see the list of search engines, but is also used to describe the paradigm of searching multiple data sources in real time. The National Information Standards Organization (NISO) uses the terms Federated Search and Metasearch interchangeably to describe this web search paradigm. Metasearch engines create what is known as a virtual database. They do not compile a physical database or catalogue of the web. Instead, they take a user's request, pass it to several other heterogeneous databases and then compile the results in a homogeneous manner based on a specific algorithm. No two metasearch engines are alike. Some search only the most popular search engines while others also search lesser-known engines, newsgroups, and other databases. They also differ in how the results are presented and the quantity of engines that are used. Some will list results according to search engine or database. Others return results according to relevance, often concealing which search engine returned which results. This benefits the user by eliminating duplicate hits and grouping the most relevant ones at the top of the list. Search engines frequently have different ways they expect requests submitted. For example, some search engines allow the usage of the word "AND" while others require "+" and others require only a space to combine words. The better metasearch engines try to synthesize requests appropriately when submitting them Results can vary between metasearch engines based on a large number of variables. Still, even the most basic metasearch engine will allow more of the web to be searched at once than any one stand-alone search engine. On the other hand, the results are said to be less relevant, since a metasearch engine can’t know the internal “alchemy” a search engine does on its result (a metasearch engine do not have any direct access to the search engines’ database). Metasearch engines are sometimes used in vertical search portals, and to search the deep web Table 2.1: Search Engines--Types and Characteristics
Table 2.1: Search Engines--Types and Characteristics (cont.)
Directory = human generated index of webpages Open Directory = a comprehensive human generated index of webpages run by volunteer editors Inktomi = proprietary search technology for search engines by Inktomi, Inc. Table 2.1: Search Engines--Types and Characteristics (cont.)
Better Meta-Searchers
Meta-Search Engines for SERIOUS Deep Digging
CSEs: Make Your Own Meta-Search Engine Google Custom Search Engines (CSEs) allow you to search the content in web pages of up to 5,000 URLs. They are easy to make at Google Coop. You will need a Google account or Gmail account. Make specialized search engines instead of using giant meta-searchers or huge search engine databases. Use them to focus on pages on a subject. For more details, see our Getting Started Creating a Custom Search Engine (PDF). References: Code: www.AllSearchEngines.com SearchEngines.com Last edited by SVhost; 11-22-2007 at 06:30 AM. Reason: Avoid to post hotlinks                 |
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#2
11-22-2007, 06:38 AM
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Very Useful post realted to Search Engine. Note: If you are posting a new topic then try to post in main IT Section. Regards
__________________   SVhost Cell: +9203332399324 http://www.hallagulla.com/urdu/information-technology-64/ |
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#4
11-23-2007, 04:57 AM
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Quote:
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#5
11-23-2007, 06:34 AM
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nice sharing, intresting and informative. |
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