Your Internet server records all hits in a log file. Log file rotation is the process of stopping logging, renaming the log file to a unique name based on the time or date, and resuming logging to a new log file. For example, suppose you wanted to analyze a day’s worth of hits at a time. To do that, you would want to rotate your server log file once a day. If your server records hits in a file called LOGFILE, you could rotate that file at 12:01 A.M. every day, renaming the file to LOGFILE.<date> and resuming logging to an empty LOGFILE.
Log file rotation is not controlled by Site Server Express Analysis, but the facility for log rotation is built into most web servers. Consult your web server documentation for instructions on how to set up log rotation.