User data (tables, indexes) and the database catalog are stored in the data
devspaces of a database instance. A table or an index needs one page (minimum); a table can use all the data devspaces (that is the whole database) (maximum).A table increases or decreases in size automatically without administrative intervention.
As a rule, a database-internal striping algorithm distributes the data belonging to a table evenly across all the data devspaces.
An assignment of tables to data devspaces is neither possible nor necessary.
You can configure one or more data devspaces when you install a new database instance. The disk storage space defined by all the data devspaces is the total size of the database. You can add new data devspaces while the database is in operation as long as the total size of the database does not then exceed the maximum size specified in the database parameter
MAXDATAPAGES.