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[Search engine] Sphinx introduction and Principle Exploration, search engine sphinxWhat/definition of Sphinx
Sphinx is a full-text search engine.Features
Excellent indexing and Performance
Easy to integrate SQL and XML data sources, and use the SphinxAPI, SphinxQL, or Sph
one of the linked pages and continues to crawl all the pages that are linked in this page.The breadth-first search flowchart for the forward graph of the upper instance, whose traversal results are:V1→v2→v3→v4→v5→v6→v7→v8From the structure of the tree, the breadth-first traversal of the graph is the hierarchical traversal of the tree. 3) Reverse Link search strategyThe number of backlinks refers to the nu
Web optimization Just do a login search engine preparation work, and finally we want to optimize the site submitted to the search engine, which is also a very important site registration.
Submit a Web site or a Web page
Submit your Web page, not your site--it used to be, and now it's
Bo jsearch is an intelligent filter based on the specific interests of a specific user, any user can use this PSE to obtain information about specific requirements. Through the establishment and sharing of personal search engines (PSE) with different user needs, a variety of PSE clusters have been formed on the blog search platform, you can use a specific human search
link is "solid ", not blocked by GOOGLE :)). But in general, these adjustments do not fundamentally solve the problem of legitimate SEO cheating.At present, many foreign search engine experts have studied this issue and put forward corresponding solutions. The most popular among them is to use "authoritative non-associated external links" as an important factor in determining rankings.
search, such as which sites you clicked, which means that these sites may be more useful to you, which sites you browse for a long time, click on more PV, This information is helpful to search engine to judge user's liking. At the same time, in the user registration of information, search engines will also be used as
the copyright notice text, navigation bar, advertising and so on. The common blog navigation for example, almost every blog page will appear in the article Classification, Historical archive and other navigation content, but these pages themselves and the "classification", "history" of the words have no relationship. Users search for "history", "classification" of these keywords simply because there are these words on the page to return blog posts is
every day. Believe that with the micro-blog to the people's lives more in-depth infiltration, enterprise users more and more content to move to micro-blogging and so on these trends, this proportion will also rise. The following figure is from Cnnic.
Sina Weibo search For example, the current Sina Weibo search to provide real-time and popular two types of micro-blog
Now listen to music there are a variety of ways, in cool dog, coolness big line, occupy the user desktop large portion of the same time. Some small public music, or need search engines to find audio-visual.
Now take the independent band-Thumb Girl and longjing, for example, experience the four major mainstream music search engine.
1. Baidu mp3:http://mp3.baidu.co
Document directory
Accuracy and recall rate
Performance
Boolean search
Probabilistic IR and relevance
Queryparser
Query
Practice
Use xapian to build your own search engine: Search
After the previous introduction, if you refer to Omega again, it is estimated that you can successfully create a database and add a
1. Search engine spider's experience, search engine spider simulates the user's browsing way crawl The website, this is our present stage SEO website internal structure optimization needs to do--satisfies the search engine the cra
I have been engaged in search engine related work has been 11 years, today with you talk about search engine core algorithm: Natural language and Boolean search. The discussion leads to the following conclusion: Search crawler and
simplifying the complexity of SOLR, users can perform related data manipulation through simple SQL statements. Tngoudb can completely throw away the Lucene knowledge associated with SOLR and can be implemented with common SQL statements.DocumentDocument Address: HTTP://WWW.TNGOU.NET/DOC/TNDB supports complete installation, configuration, and use of documentation.Use caseNow TNGOUDB is the internal test version, please do not use for online projects!
and recall rate can be considered. Literally, it seems that there is still a spectrum of accuracy, but how can we explain the recall rate?Accuracy and recall rateSometimes, accuracy is also called accuracy. For example, a database contains 500 documents, 50 of which comply with the definition. The system has retrieved 75 documents, but only 45 of them comply with the definition.
Recall rate R = 45/50 = 90%
Precision P = 45/75 = 60%
In this example, the system
complexity of SOLR, users can perform related data manipulation through simple SQL statements. Tngoudb can completely throw away the Lucene knowledge associated with SOLR and can be implemented with common SQL statements.DocumentDocument Address: HTTP://WWW.TNGOU.NET/DOC/TNDB supports complete installation, configuration, and use of documentation.Use caseNow TNGOUDB is the internal test version, please do not use for online projects! We will continue
and display the corresponding page content.
Site Internal Inquiries
When you find a page, the search engine provides the ability to query other pages of the site. Similar to "site:", "Host:" and other commands.
Horizontal related Query
When a user finds a page of interest, the search engine provides the functionality
is the keyword density, I believe that the SEO friends are aware of this. Of course, search engine to judge the relevance of a site to give the ranking is to see the keyword density. So as long as the awareness of SEO friends, as long as their own web site or Web page to increase the density of keywords can get a pretty good ranking. It is because such people cheat is very simple, even more outrageous is t
, In order to attract more partners, with the Beijing Aerospace University for Scientific research, and transport, finance, medical industry, such as in-depth cooperation. The open platform can not only make the existing machine learning function more extensive value, but also can verify and perfect the existing machine learning model through more application and the introduction of external resources.
Third, the search
the user in order, depending on the degree of correlation.3 Directory index editing Compared to full-text search engines, there are many differences in directory indexing. First, the search engine belongs to the automatic site retrieval, and the directory index is completely dependent on manual operation. After the u
, there are several non-mainstream forms: 1, integrated search engine: such as HotBot in the end of 2002 launched the engine. The engine is similar to a meta search engine, but the difference is that instead of invoking multiple e
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