Hybrid Columnar Compression (HCC) is a storage-related Oracle Database feature that causes the database to store the same column for a group of rows together.
Storing column data together in this way can dramatically increase the storage savings achieved from compression. Because database operations work transparently against compressed objects, no application changes are required.
The HCC feature is available on database deployments created on Oracle Database Cloud Service using the Enterprise Edition - High Performance or Enterprise Edition - Extreme Performance software edition.
For more information about HCC, see: