Csaba,
> Regularly clustering is out of question as it would render
> the system unusable for hours. There's no "0 activity hour"
> we could use for such stuff. There's always something
> happening, only the overall load is smaller at night...
We are planning to implement a btree organized table, which keeps the
data organized by storing it with the index and using btree insertion to
store the data. This will make your design more attractive.
- Luke