With Exadata v2 there is another offer in the portfolio of Oracle compression technology: Hybrid Columnar Compression. You have two types of compression (online and archive) and each one has a low and high compression algorithm.

So when you create a table on Exadata v2 Storage you can use one of the four combinations

To read the entire article at its source, please refer to Exadata Hybrid Columnar Compression (EHCC)