Each non-clustered table has a data segment. All of the table's data is stored in the extents of its data segment. Each cluster has a data segment. The data of every table in the cluster is stored in the cluster's data segment.
PriVATe database link is created on behalf of a specific user. A priVATe database link can be used only when the owner of the link specifies a GLobal object name in a SQL statement or in the definition of the owner's views or procedures.