So let's say you have a 10gR2 database that you need to downgrade to 10gR1. You have no choice, you have to downgrade. The immediate solution that comes to mind: - export the entire database - shutdown the database. - trash the 10gR2 software - install 10gR1 software, and create an empty database. - import a lot of schemas with a ton of data. Or, second option: - export the transportable tablespace metadata. - shutdown the database. - trash the 10gR2 software - install the 10gR1 software and create an empty database. - import the transportable tablespace metadata. Has anyone actually executed the second option?? Is it doable?? CxG