I saw in UIM 8.31 database session install that we have to create a pluggable database.
"Create an Oracle 12c Database (Schema) Manually
Create a pluggable database using the files of a seed database. See the Oracle documentation ( for details about the options available when http://docs.oracle.com/database/121/ADMIN/cdb_plug.htm ) you create a database from a seed."
Is that realy need?