Description of problem:
We should add to this section :
2.3.3.2. Oracle Database Requirements
https://access.redhat.com/site/documentation/en-US/Red_Hat_Satellite/5.6/html-single/Installation_Guide/index.html#sect-Installation_Guide-External_Database_Requirements

In addition to this statement :
=================
    The precise access levels required by the Oracle user are as follows:

    ALTER SESSION
    CREATE SEQUENCE
    CREATE SYNONYM
    CREATE TABLE
    CREATE VIEW
    CREATE PROCEDURE
    CREATE TRIGGER
    CREATE TYPE
    CREATE SESSION
=================
We should add the following :
=================
   note: the database user has to have privileges above granted directly (not via role)
 
Example :
   SQL> grant  CREATE SEQUENCE, CREATE SYNONYM, CREATE TABLE, CREATE VIEW, CREATE PROCEDURE,CREATE TRIGGER, CREATE TYPE, CREATE SESSION, ALTER SESSION to rhnsat;
=================

There have been 2 support cases so far where customer's using external db's did not have this set and they were unable to upgrade.