The session identification splits all the pages accessed by the IP address which is a unique identity and a timeout, where if the time between page requests exceeds a certain limit, it is assumed that the user has started a new session. 30 minutes default timeout is considered. Figure 4 shows a fragment from session identification result. A fraction of log files with user sessions shown in figure 4. There were a total of 71,242 unique visiting IP addresses, 935 unique pages and 130,976 sessions.