Importance Of Google Bots

To build a searchable index for the Google search engine

, Google uses Googlebot, it is a search bot software to collect documents from the web. To restrict the information of a particular website available to Googlebot, a webmaster has to add the Meta tag to the web page. The crawling and indexing of the new web pages can be done by Googlebot, if they are linked to other known web pages. An enormous amount of bandwidth is used by Googlebot and it is a problem noted by webmasters often. It affects websites to exceed their limit of bandwidth and it is a trouble for mirror sites (an exact copy of another internet site) which host many gigabytes of data. They are also called as crawlers, robots and spiders.

Googlebot accesses your website once in an every few seconds on average but due to network delays this rate can be higher for short periods. A page is downloaded multiple times by Googlebot if the crawler was stopped or restarted; otherwise it downloads only one copy of a page at a time. To improve performance and scale, Googlebot is distributed on several machines. Many crawlers are run on machines located near the sites to cut down the usage of bandwidth. Hence, a log shows visits from several machines at google.com, all with Googlebot. The main goal of Googlebot is to crawl many pages from the site on each visit without overwhelming the bandwidth.

A webserver cannot be kept secret by not publishing links. There are many broken and out-dated links in a web. As soon as an incorrect link is been published at the site, the Googlebot will try to download that incorrect link. A Googlebot can be restricted to crawl the site by using robots.txt file. The robots.txt should be in correct location to prevent Googlebot from crawling. By placing robots.txt file in a sub directory it would not have any effect, so it must be placed in the top directory of the server. By adding rel=no follow attribute to the link, that link can be prevented from crawling by Googlebot. But to get listed in Google, Googlebot should visit your site.

The site should be crawlable because Googlebot discovers it by following links from page to page. The problems are listed in webmaster tools by the crawl errors page founded by Googlebot when crawling your site. To identify any problems with site, these crawl errors should be reviewed regularly. The Googlebot keeps on changing their IP addresses time to time. By using a reverse DNS look up, it can be verified that a bot accessing the server is really a Googlebot. Some spammers dont respect the directives in robots.txt, but Googlebot does it. Feedfetcher is also one of the user agent used by Google. Feedfetcher does not follow robots.txt guidelines as its requests come by adding feeds to their Google home page or to Google Reader and not from automated crawlers. If the server is configured to serve a 404 or 410 error status message, than the site can be prevented from crawling by Feedfetcher.

by: Altaf Shaikh

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