I setup this tool but I was after more frequent collection of performance counters for overall sytem health (System, ASP, etc). I think I set it for hourly collection and the database quickly grew to large.
Not to knock this tool but for my purposes I have opted to use the round robin database http://www.rrdtool.org. Adrian Wood put together a complete package for system monitoring including an ASP front end called wshRRD which is available at http://members.optusnet.com.au/~picuspickings/
There is also a java version of this solution called JRobin (http://www.jrobin.org/) but I havn't tried it yet.
The set up is probably as involved as SQLH2 but the nature of RRD means that the database size is fixed. In my case the the db size for each performance counter (each instance) is 41kb and will never get bigger! It has a built in graphing function. So now I collect performance counters every 10 minutes without having to worrey about it consuming my harddrive.
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