Oracle has introduced a new data storage technology in Exadata V2 called Hybrid Columnar Compression. This method uses a "compression unit" that is made of several rows; it is physically stored in compressed "column vectors" in multiple blocks of storage.
There are two flavors of columnar compression that are optimized for "QUERY" (warehouse compression better for executing queries) and "ARCHIVE" (best data storage for archive compression)
Each of the QUERY and ARCHIVE come with another modifier to set the "LOW" or "HIGH" compression mode.
This technical white paper gives an overview of the new technology.
This article on Oracle Magazine may also be useful in understanding this new feature.
More data can be stored in "less" space. Good!
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