On Thu, 11 Jan 2001, Michael R. Bagnall wrote:
>
> Scenario One:
> -------------
> At the end of every day, read in and analyze the old cache files and the new
> log file in one operation - creating a new cache file. (my question: Does
> analog create the new cache file from just the new log data or from the old
> cache files AND the new log data - thereby creating the possibility for
> double counting)
>
Answer: The latter. Don't do this. You've already understood why.
> Scenario Two:
> -------------
> At the end of every day, read in and analyze the new log file, create a
> cache file for it and build the report from all the cache files. (would I
> need to have two analog.cfg files for this? One to generate the cache file
> and a second to analyze all the cache files?)
>
This is the simplest way. Make sure to rotate the logfile first before
turning it into a cache file of course, so that its contents is finalised.
> Furthermore, I don't suppose there is a way to have one cache file
> containing all of the information from previous analysis that is appended to
> as time goes on.
>
Well, yes, it is possible. Keep only one cache file, use it and the
newly-retired logfile to make the new version of the cache file, then move
the new version on top of the old version.
I don't recommend this however, as I think it's conceptually harder, and
also if you corrupt the cache file accidentally you've lost everything. You
will save a little disk space and future processing time, but Scenario Two
probably saves enough already.
--
Stephen Turner http://www.statslab.cam.ac.uk/~sret1/
Statistical Laboratory, Wilberforce Road, Cambridge, CB3 0WB, England
"Your account can only be used for a single internet session at any one
time and for no more than 24 hours in any one day." (NTL terms of use)
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