access.log,件在 WEB 服務器運行一段時間之後會達到幾十兆甚至上百兆，如果Apache運行有錯誤,error.log也會增大到幾十兆，我們知道系統讀寫一個大的文本文件是非常耗內存的，因此限定日誌文件大小十分必要。
通常我們是在{$apache}/conf/httpd.conf中設置Apache的參數，然而我們並沒有發現可以設置日誌文件大小的配置指令，通過參考http://httpd.apache.org/docs/2.0/programs/rotatelogs.html，可以用apache 自己的程序 rotatelogs.exe(位於 {$apache}/bin/目錄下)，來限制日誌文件的大小。
Usage: rotatelogs [-l] <logfile> <rotation time in seconds> [offset minutes from UTC] or <rotation size in megabytes>
Add this:
TransferLog "|rotatelogs /some/where 86400"
or
TransferLog "|rotatelogs /some/where 5M"
to httpd.conf. The generated name will be /some/where.nnnn where nnnn is the system time at which the log nominally starts (N.B. if using a rotation time, the time will always be a multiple of the rotation time, so you can synchronizecron scripts with it).
At the end of each rotation time or when the file size is reached a new log is started.
在 Windows 下的設置例子如下：
# 限制錯誤日誌文件爲 1M
ErrorLog "|bin/rotatelogs.exe -l logs/error-%Y-%m-%d.log 1M"
# 每天生成一個錯誤日誌文件
#ErrorLog "|bin/rotatelogs.exe -l logs/error-%Y-%m-%d.log 86400"
# 限制訪問日誌文件爲 1M
CustomLog "|bin/rotatelogs.exe -l logs/access-%Y-%m-%d.log 1M" common
# 每天生成一個訪問日誌文件
#CustomLog "|bin/rotatelogs.exe -l logs/access-%Y-%m-%d.log 86400" common
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