Bonjour Rainer Mager
> 
> Good ideas except I think I wasn't clear. The system is a commercial product
> with numerous individual customers. Each customer is somewhat unique and we
> want to have the system capable of vacuuming automatically for all users.
> 
> The thing is that some users might have systems that are used little in the
> early morning but others might be very different. We would rather not do
> usage statistic gathering/analysis if there was a better way.

        We have the same kind of application here.
        We vacuum according the load, if the load start to be "high"
        we vacuum ->earlier<-, ok there is a little penalty on users, but as soon
        the data-base is clean, the performance is dramaticaly improving
        and the load just drop. So instead to have user penalised
        for a long time, we just use it as a trigger to clean the base.
        (we do not want the user to vacuum at will)

A bientot
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Jean-Marc Pigeon                  Internet:   [EMAIL PROTECTED]
SAFE Inc.                   Phone: (514) 493-4280  Fax: (514) 493-1946
     REGULUS,  a real time accounting/billing package for ISP
        REGULUS' Home base <"http://www.regulus.safe.ca">
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