Hybrid Columnar Compression (HCC) on Exadata (White Paper)

Oracle White Paper
Hybrid Columnar Compression (HCC) on Exadata 

Introduction
Hybrid Columnar Compression on Exadata enables the highest levels of data compression and provides enterprises with tremendous cost-savings and performance improvements due to reduced I/O. HCC is optimized to use both database and storage capabilities on Exadata to deliver tremendous space savings AND revolutionary performance. Average storage savings can range from 10x to 15x depending on which Hybrid Columnar Compression level is implemented – real world customer benchmarks have resulted in storage savings of up to 204x.
With average storage savings of 10x from HCC, IT managers can drastically reduce and often eliminate their need to purchase new storage for several years. For example, a 100 terabyte database achieving 10x storage savings would utilize only 10 terabytes of physical storage. With 90 terabytes of storage now available, IT organizations could potentially delay storage purchases for a significant amount of time. The 90 terabytes of storage could even be used to store up to 9 more databases with 100 terabytes of data compressed to 10 terabytes of actual disk space each.
Hybrid Columnar Compression is an enabling technology for both Warehouse Compression and Archive Compression. We will discuss each of these capabilities in detail later in this paper, but first let’s explore the implementation/benefits of Hybrid Columnar Compression on Exadata – the next generation in compression technology. 

http://www.oracle.com/technetwork/database/exadata/ehcc-twp-131254.pdf