> Are there scripts to automate this look at stats?
> Or could one draw graphs from that values, to visualize how well the db
> is? E.g., if you could calculate a % value, you could make RRD stats to
> see it's change over time. Is there any project on this?
I don't know about rrd graphing it, but there are some great nagios plugins for this at http://bucardo.org/nagios
You could have a look at the queries used in those and roll your own mrtg plugins. If you do, please share.