Thanks anyway for the clue

But I think it is not the one i wanted ..it is like this:

Say, i have USERS tablepace 2Gb size, then I create a table with pre-allocated space of 2Gb.
so the TS is 100% used, but the table has no data yet. It will report something like 0 blocks used and 100% blocks free?
or near to that....something like that

Any other clue dear?

Thanks