Hi,

If you have only indexes in you can rebuild the online if you are running on 8i.

You only need the extra disk space. If you hav got a mix of tables and indexes in this tablespace create two new tablespaces and and move a table to one and rebuild its indexes to the other one. And keep it like that.

Get rid of the tablespace with the dropped datafile asap. I had a problem once couldn't upgrade because of a dropped datafile.

Tycho