NexusDB

Each IndexDescriptor object owns a KeyDescriptor object. The KeyDescriptor classes are responsible for creating the index keys which are used to determine the collation sequence. There are two built-in variants: TnxRefKeyDescriptor and TnxCompKeyDescriptor. The TnxRefKeyDescriptor class is used to generate simple unique keys for the Sequential Access Index, and owns no further child objects. The TnxCompKeyDescriptor class is used for Indices composed from one or more fields.