Native Directory refers to the relational database that Oracle's Hyperion® Shared Services uses to support provisioning and to store seed data such as default user accounts.
Native Directory functions:
Maintain and manage the default EPM System user accounts
Store all EPM System provisioning information (relationships among users, groups, and roles)
Native Directory is accessed and managed using Oracle's Hyperion® Shared Services Console. See “Managing Native Directory” in the Oracle Hyperion Enterprise Performance Management System User and Role Security Guide.