How do I create tablespaces in Oracle?
A tablespace is an area of the disk comprised of one or more files where Oracle keeps the tables, indexes, and clusters that have been defined. An empty tablespace must be created for each database that you want to set up in Oracle. For step-by-step instructions on how to use the SQL Plus Builder tool that comes with Oracle in order to create these tablespaces, see Tech Note #14957 and Tech Note #15496.