Hybrid Columnar Compression
Hybrid Columnar Compression offers higher compression levels for direct path loaded data. This new compression capability is recommended for data that is not updated frequently. You can specify Hybrid Columnar Compression at the partition, table, and tablespace level. You can also specify the desired level of compression to achieve the proper trade-off between disk usage and CPU overhead. You can use the compression advisor to help you determine the proper compression levels for your application.
See "Consider Using Table Compression".
