SeoblogR

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Search engines can be divided to author-controlled, editor-controlled and user-controlled. Google and AltaVista belong to the first group as they create their rankings based on the keywords found on indexed websites. Second group represents Yahoo! and LookSmart, which add sites to catalogs creating a tree structure. User-Controlled group can be represented by Direct Hit. This last group values each page depending on amount of visitors to the page.

Each website owner wants their site to be viewed and visited by many visitors. To achieve that the site has to be visible in search engine results for keywords related to this website. But the position on which it appears is very important. It is not enough just to “be” in search engines, you have to “be high in results”. The best position is among first 3 results for a keyword. Why is it so important? Most users find the first search engine results page (SERP) as the most valuable and important to their query. They will look through this page to find the most suitable site for them to visit.

Internet users rarely watch the second and third SERP as they think they are less related and less important. It shows how seriously users treat search engines and how much they trust their algorithms. Most people recognize search engines to be reliable, trustworthy and impartial as a source of information about internet websites. That’s why no site owner should forget about search engines as it is great source of possible visitors and potential clients to our website.

The most known and recognized search engine among internet users (and not only) is Google. It is ascetic search engine that revolutionized the internet. It was founded in 1998 by Sergey Brin and Lawrence Page, two very talented computer scientists who introduced the prototype of Google search engine at Stanford University.

Most internet users have no idea what complex technology stands behind Google. This search engine is able to search its indexes around 1000 per second returning results for different search terms. Google is based on a network of thousand of low-cost computers and can therefore carry out fats parallel processing. Some calculations show that if combined together, Google would posses the biggest computational center in the world!

Google physical structure consist of clusters of computers situated all around the world known as server farms. They run Linux based systems with GFS, Google File System.

Some of the key features about Google:

• About 4 billion indexed pages, each average 10 kB (4 Tb overall data)
• 6 Tb of hard drive space
• 104 languages, including “Klingon”, used by characters from StarTrek
• Around 30 clusters
• 80,000 machines
• 300 Ghz of processing power
• Up to 2000 computers in one cluster
• 160 CPUs
• One cluster is equal to 1 Pb of data, which is million gigabytes
• No breakdown since year 2000 when main switch broke down
• 160 Gb of RAM drive
• 800 employed computer scientists, among which 200 have PhDs