Check Oracle Database Initialization
If your cluster uses Oracle for any databases, before
upgrading from CDH 5 check the value of the
COMPATIBLE
initialization parameter in the Oracle Database using the following SQL
query: SELECT name, value FROM v$parameter WHERE name = 'compatible'
The default value is 12.2.0. If the parameter has a
different value, you can set it to the default as shown in the Oracle Database Upgrade
Guide.