Sorry guys!
So let's go!
I need to create a scenario using "Production and Publication Geodatabases", but only one instance Oracle 11g R2, in the same tablespace.
Following steps below:
1) In Oracle, I created the SDE user with privileges for CRATING an SDE master geodatabase. In ArcGIS > ArcCatalog > Data Management > Enable Enterprise Geodatabase > SDE Connection;(OK)
2) In Oracle, I created the GIS user with privileges for UPGRADING an SDE master geodatabase. (OK)
3) In Oracle, I created the SDE2 user with privileges for CRATING an SDE master geodatabase. In ArcGIS > ArcCatalog > Data Management > Enable Enterprise Geodatabase > SDE Connection;(ERROR)
Why the third step doesn't work?