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Not only Google's index of more than 10,000 servers and the servers are still in 7 different data centers placed. These data centers are mainly located in the United States of America (for example, Santa Clara, California, Herndon, Va.), even in June 2002, the first European in the Google data center in Zurich, Switzerland on the Internet. It may have more information centers, which can spread to the whole world. In order to direct traffic, all these data centers, Google thoeretically record of all inquiries, then concentrate on the data center. Yet it clearly inefficient. In fact, data center has its own email address IP (Internet rooms) and IP address information obtained by means of a system of management domain name. Basically, DNS works like this: Internet, data is always between the two IP addresses. Analysis of the data in the field of IP addresses by name server DNS. When a user's browser, the local domain name server configuration, the IP address in connection with the domain name server of the responsibility to obtain. (DNS is a hierarchical structure of illustrations, the whole process will be far beyond the scope of this article ..) IP address, and then you ?? cache server, so it's not worth the server name of a reliable partner for each outgoing connection with the domain. Name of contact person record in the server space, how long the record gekasseer by the cache name server. The life domain (TTL) period. Until the TTL expires, the cache server, the name of the domain name for the record from the server again. In many cases, TTL set to 1 day. In contrast, the survival time of the domain www.google.com is only five minutes. So, the name server may only cache the IP address of Google in five minutes, and then find the IP address of their behavior. Each time, contact Google's name server information center only back an IP address. Thus, searches are always different data centers by changing the DNS records. On the one hand, DNS records based on a single load the data center. Thus, Google will use DNS for its simple form of load balancing. On the other hand, the domain name server cache location affect the frequency of receiving a single data center IP addresses. This allows the transmission distance is reduced. To illustrate, DNS records domain www.google.com, we are here as an example domain name server cache. As data center, DNS, and Google Dance are related, easy to answer. Google Dance in the data center do not have a new index, while at the same time. In reality, the new index is transferred to the data center to another. When a user asks Google Dance, he may be from the data center, there is little time to chat message from the data center, it has the new index a few minutes later, the old results of the index. From a user perspective, the index work takes place within a few minutes. But, of course, this process can be reversed, so, Google seems old and new code-breaker. itches, it would seem, between the old and new index. Web site design,seo and web development
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