Search engine is divided into a full text search engine, index, meta search engine, meta search engine is through a unified user interface to help users in multiple search engines in the selection and use of appropriate ( or even at the same time using a plurality ) search engine to achieve the retrieval operation, is distributed on the network retrieval tools global control mechanism.
Meta search engine
A true meta search engine consists of three parts, namely: retrieval request mechanism, retrieval interface agent mechanism, retrieval result display mechanism. " Request" is responsible for the implementation of" personalized" user retrieval settings, including calling which search engine, retrieval time limit, the limit etc.. " Interface agent" will be responsible for the user's retrieval request" translation" to meet the needs of different search engines" localization" request format. " The results show" is responsible for all elements of search results in search engine to heavy, merge, output processing. Meta search engine, for those who need to continuously use different search engines to repeat the same retrieval of the people, is a gospel. The use of meta search engine at the same time on several search engine retrieval, retrieval results obtained hierarchical arrangement.
Meta search engine principle
Meta search engine working principle
We can put the meta search engine as a double client / server structure system. Meta search engine user to search request is made, meta search engine according to the request to a plurality of search engine retrieval request from the actual implementation of meta search engine, search engine retrieval request after the search results in response is transmitted to a meta search engine, meta search engine from a plurality of search engine search results after finishing at response is transmitted to the actual user. Of course, some meta search engine has a slightly different mechanisms.
Meta search engine classification
In can be retrieved by search engine, query processing way and how to compile and display results, meta search engine has the very big difference. Some element of the engine and a search target search engine, others at the same time search. Some search engines will query into a search engine query language, and some will wholly intact sent to the target engine.
According to the function division, meta search engine includes multiple cue type search engine and All-in-One type search engine; according to the operation mode of the differences can be divided into online search and desktop search engine.
Meta search engine development and Prospect
Meta search engine is to make up for the deficiency of traditional search engine and the emergence of a assisted retrieval tools, have a traditional search engines do not have many advantages. However, meta search engine is dependent on the database technology, text selection techniques, query assigned technology and results of comprehensive technology. Improved user interface, call strategy, perfect integration of information and eventually returned to the ranking of search results, is still the focus of the study of meta search engine.
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