Certain circumstances may warrant re-processing of log data, such as
a DNS server being down when the processing was, incorrectly applied
filters, and so on. The following document describes the proper
procedure necessary to back out and reprocess webserver log data.
Please note that reprocessing logs requires the use of Urchin
utilities that are only available from a command line shell
environment. It is not possible to do the complete procedure
exclusively from the Urchin web-based administrative GUI.
Reprocessing a Single Day:
In the Urchin admin GUI, edit the Profile and turn off Log
Tracking under the Storage/DB tab. Be sure to click Update to
save your change.
Under the Log Sources tab, ensure that the proper log file
(s) to be re-processed are specified. The log data should only
contain hits for the date(s) that you are zeroing out the statistics
Invoke a command shell on the Urchin system
Run the udb-sanitizer utility in the 'util'
directory/folder of the Urchin distribution with the command
udb-sanitizer -p profile-name -d YYYYMM
where YYYYMM is the year and month containing the day you wish
Select option 5, Zero out one or more days. The utility will prompt
you for the correct day and will zero out the statistics for that
particular day. If you have a range of contiguous days you'd like to zero you
you can specify that range by using the numbers of the start and end days separated
by a hyphen (e.g. 5-10 to zero out days 5 through 10 of the month). If necessary, re-
invoke the utility to zero out
statistics for additional days in that month if you cannot use a range.
Click the Run Now button under the Run/Schedule tab
for the Profile to reprocess the log data
Reset the Log Source by changing the Log File Path back to its
Under the Storage/DB tab in the profile edit area, turn Log
Tracking back on
Reprocessing an Entire Month:
The procedure for reprocessing an entire month's worth of data is
identical to the single day procedure above, except when invoking the
udb-sanitizer utility select Option 2, Delete this month
entirely instead of Option 5.
The udb-sanitizer utility provides additional functionality
for managing Urchin databases. Please see the udb-sanitizer article
in the Advanced Topics->Utilities section for further information about its