New features In-Memory Column Store and Aggregation in 12.1.0.2

In-Memory Column Store and In-Memory Aggregation features require In-Memory option, which is available as a database option in Enterprise Edition 12.1.0.2.

Since these features available starting with 12.1.0.2, the compatibility must be set to 12.1.0.2 or higher in order the features to be active,

although the features are disabled by default due to the default value for parameter INMEMORY_SIZE is 0.

You can find more information in the following sources:

New features guide

In-Memory product home on otn

Oracle Database In-Memory white paper by Maria Colgan (July 2014)