Web usage mining focuses on the discovering of potential knowledge from the browsing patterns of the users. It leads the authors to find the correlation between pages in the analysis stage. The primary data source used in web usage mining is the server log-files (web-logs). Browsing web pages by the user leaves a lot of information in the log-file. Analyzing log-files information drives them to understand the behavior of the user. Web-logs include web server access logs and application server logs. Web-log is an essential part for web mining to extract the usage patterns and study the visiting characteristics of user.