14 DAY TRIAL // Dirk Lewandowski, Henry Wahlig and Gunnar Meyer-Bautor at the Heinrich Heine University in Dusseldorf have decided to analyze the search engines by looking at the database update rate.
The starting point was that there are sites that update their content on a daily basis and are capable to add new pages every day. Are the search engines able to keep up with these changes? What is the rate at which the search engines update their index and is there an update pattern?
Their study included the main search engines -MSN, Google and Yahoo. The 38 sites were chosen among portal, news and lifestyle sites.
The conclusions were that Google succeeds to index daily the highest number of updated pages, while MSN is the only one capable of indexing all the changes within 20 days. Yahoo has the most chaotic update mode, in both frequency and number of pages.
The conclusions are valid for the German versions of the search engines and a complete version of the study is available here.
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