Table: A set of tuples.

Distribution Group: All tables of a distribution group are distributed in the same manner.

Distribution Directory: This mapping is stored in Zookeeper and determines which node is responsible for which area.

Distribution Region: A subspace in an n-dimensional space.

Tuple store: Stores a set of tuples. The data of one table of one distribution region is stored in a tuple store. The tuple store stores the data in Memtables and in SSTables.

Tuple store configuration: The configuration of a tuple store. Among other things, this configuration defines whether the tuple store allows duplicates or not.