In DB2 replication, a table created for and used by an application before it is defined as a replication source. It is used as the source for updates to read-only target tables, consistent-change-data tables, replicas, and row-replica tables.
User-defined tables are stored containers, and containers are stored in table spaces. The wizard will create the default table space, called USERSPACE1. More user table spaces can be added later, but there must be one default table space when the database is created.