alter table set tablespace

I want to move one table from one disk to another.

In order to do this I wanted to create a new tablespace on the new disks and
issue the command alter table tablename set tablespace tablespacename;

The question is, will this in any way affect the database which is in heavily
use?

The table in question is the largest one approximately 90GB.

Thanks

Leif Gunnar Erlandsen