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The HR_NAV_UNIT_GLOBAL_USAGES table in Oracle E-Business Suite (EBS) versions 12.1.1 and 12.2.2 is a critical data structure within the Human Resources (HR) module, primarily used for tracking navigation unit global usages. This table plays a pivotal role in managing user access and navigation within the HRMS (Human Resource Management System) framework, ensuring that users are directed to the appropriate functional areas based on their roles and permissions. Below is a detailed analysis of its purpose, structure, and significance in Oracle EBS. ### **Purpose and Functional Overview** The HR_NAV_UNIT_GLOBAL_USAGES table is part of Oracle's HRMS security architecture, which governs how users interact with the system. It stores metadata related to navigation units—logical groupings of functions or pages—that determine how global usages (access permissions) are applied across different HR modules. This table helps enforce role-based access control (RBAC) by defining which navigation units are accessible to specific responsibilities, user roles, or global contexts. ### **Key Columns and Data Structure** The table typically contains the following columns (exact schema may vary slightly between EBS 12.1.1 and 12.2.2):

  • NAV_UNIT_ID: A unique identifier for the navigation unit, linking to HR_NAV_UNITS.
  • GLOBAL_USAGE_ID: A reference to global usage definitions, often tied to responsibilities or security profiles.
  • USAGE_TYPE: Specifies the context of usage (e.g., "RESPONSIBILITY" or "SECURITY_PROFILE").
  • ENABLED_FLAG: Indicates whether the navigation unit is active for the given usage.
  • CREATED_BY, CREATION_DATE, LAST_UPDATED_BY, LAST_UPDATE_DATE: Audit columns for tracking changes.
### **Integration with Oracle EBS Security** This table works in conjunction with other HR security tables like:
  • HR_NAV_UNITS: Defines navigation units and their hierarchies.
  • FND_RESPONSIBILITIES: Maps responsibilities to users.
  • PER_SECURITY_PROFILES: Manages data-level security for HRMS.
When a user logs in, Oracle EBS queries HR_NAV_UNIT_GLOBAL_USAGES to determine which navigation units (e.g., "Payroll," "Recruitment") are accessible based on their assigned responsibilities or security profiles. This ensures compliance with segregation of duties (SoD) and least-privilege principles. ### **Technical Considerations**
  • Performance: Indexes on NAV_UNIT_ID and GLOBAL_USAGE_ID optimize query performance during access validation.
  • Customization Impact: Modifications to this table (e.g., adding custom navigation units) require careful testing to avoid security gaps.
  • Upgrade Compatibility: Schema changes between 12.1.1 and 12.2.2 are minimal, but patches may introduce new columns or constraints.
### **Business Impact** By centralizing navigation unit permissions, this table streamlines HR operations, ensuring users only see relevant functions. For example:
  • Payroll administrators access payroll-related navigation units.
  • Recruiters are restricted to talent acquisition modules.
### **Conclusion** The HR_NAV_UNIT_GLOBAL_USAGES table is a cornerstone of Oracle EBS HRMS security, enabling precise control over user navigation. Its design supports scalability, compliance, and efficient access management, making it indispensable for organizations leveraging Oracle HR modules.