Cloudera and Oracle partnered to bring a reliable mainstream enterprise solution of Big Data through the Oracle Big Data Appliance. It is designed and optimized for big work load and built using standard hardware.
Oracle Big Data Appliance is a supported big data infrastructure which is affordable , salable and integrated with the key components of big data platform.
CDH (Cloudera Distribution Including Apache Hadoop) is for enterprise deployment which is included with the Oracle Big Data Appliance. It has a free version and it supports up to 50 node but it can scale up with the paid version.