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    that log files frequently change names. To avoid excessive
    processing time and minimise computing resource consumption, any
    log processing system should be intelligent enough to avoid
    reprocessing files where only the file name has been
    altered. Similarly, if the file compression level has changed (but
    not the actual true content) then log messages should not be
    parsed more than once.</p>

    <h3>Allow reprocessing of the log messages</h3>

    <p>Clearly if the approach is to ignore a large percentage of the
    log messages and avoid reparsing previously seen messages then
    occasionally a need to re-process the log files will occur. This
    is most likely when an administrator has a new requirement to
    analyse data related to some facility and generate long-term
    statistics. It should be possible to go back through the system
    logs and import more log messages where required.</p>

    <h3>A single, straightforward query mechanism</h3>

    <p>It should be possible to query all the data using a single,