SEO Novice must see search engine work principle one

Novice SEO is for what, that is, in order to have a good ranking, in addition to large web sites can rely on the long tail to bring huge traffic, the general new webmaster can use SEO to get a stable keyword ranking, you can bring a stable flow of online SEO articles a dime, but they have to have the system to learn the process, Want a good ranking, we must know how the search engine work principle is roughly how, the detailed work principle you do not have to manage, it is said that the whole world also not a few, nonsense not to say more, enter the topic.

The working principle of the search engine is very complex, mentioned in front of really understand the world also few, but we just know some fur is enough. The working process of search engine can be divided into three stages.

I. Crawl and crawl

This everyone should know, is the search engine spiders through the crawling link to visit the Web page, and then grab the page's HTML code to save to the server's database.

Two. pretreatment

This is the ranking of a processing process, indexing the spider crawled to the page data to extract text, and then participle, index and other processing.

Three. Ranking

When you enter the keyword you want to query in the search box, the ranking program calls the index library data, calculates the dependencies, and then generates the search results page, where you can see the results of your search.

Seemingly simple three stages, in fact, each step of the algorithm is complex. Let's talk about crawling and grabbing today:

Crawl and crawl is the first step of search engine work, complete data collection task.

In order to crawl the content of the Web, spiders will track the links on the page, from one page to another page, and spiders crawling on the web is the same, this is the name of the spider.

Spider crawling method has two kinds, the first is depth first, the second is breadth first. Depth first refers to the spider crawling forward along the link until there is no link, then return to the first page, along another link to climb down.

Breadth optimization refers to the spider found on a page of many external links, not along a link to crawl forward, and the page all the first layer of the link to crawl all over, and then climb the second layer.

In fact, the two methods are mixed, so theoretically can climb the entire internet, but because of resources, time constraints, often only crawling crawl a small part, so attract spiders is SEO must do homework. So I need to talk about which pages the spider will crawl or crawl the probability is high.

1. With the home click Distance near, generally speaking, the home page weight is the highest, so the spider to visit the highest frequency, so the distance from the home page near the probability of being crawled high.

2. Page update fast, every time the spider crawling will be data saved up, if the second crawl does not change, the description is not updated, spiders think that this page is not necessary to crawl, if you update quickly, the spider will be updated, here say a little ah, in my previous A5 in the article also mentioned, Is the update is best to have a timetable, fixed time every day update, I posted a link interested in the article can look at the next http://www.admin5.com/article/20100112/204187.shtml.

3. is to go to the weight of the site to send point links, this will also improve the probability of being crawled.

Another thing to say is the address library, here is simply said that the address library is to prevent repeated crawling and crawling URLs. Today is written here, tomorrow will be written about the preprocessing and ranking part. This article by Zhangjiagang Pipe Bender http://www.zjgjixie.com Webmaster, reproduced please leave a link. Other related enterprises, machinery, such as links to Web sites, some please add qq:26043721