Turn into Oracle to do the project, sister's, too pit Dad, Oracle does not have the concept of database, is to build roles, assign permissions, seemingly very powerful, after building the right to check the data when the error said that the users table space does not have permissions, in the role of the right to assign the rights of the DAB, Do not know why also reported this wrong, pit dad, Baidu found this, the solution is to give the role to assign a resource permission, and then really good.
http://blog.itpub.net/24709845/viewspace-675731/
There is also no concept of self-growth, there is a serialization that can be used instead of self-growth. The concrete usage does not know, again studies.
ROWID is Oracle's own unique identity, usually not used, but it is important to hear that it is used. It's still going to be a study.
Oracle of the Pit daddy