To export source tablespaces, an auxiliary database system is created and started with a minimum configuration. Copies of versions of the source tablespaces are restored from database backups to the auxiliary database system. A copy of a version of a tablespace is referred to herein as a tablespace instance....http://www.google.de/patents/US7610314?utm_source=gb-gplus-sharePatent US7610314 - Online tablespace recovery for export
