Httpd-log files

I'm using getstats for my monthly statistics in Data Library. For using 
this program I have to specify the log file which for WWW is httpd-log. 
This file used to include all the accesses starting with the earliest 
date and ending at the most recent one - all the information in one file. 
Some time ago it started to break the information and automatically 
create a separate httpd-log file for each week or even worse for one day.
Is there something I can do to prevent that and what is the reason of 
suddenly creating these files. Thank you for your help!

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Alice Iordache             Internet:  alice@datalib.ubc.ca
UBC Data Library           
Data Services Assistant    Phone: (604)822-5587    
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Received on Tuesday, 2 May 1995 15:22:56 UTC