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The HR_DM_SEQUENCE_RANGES table in Oracle E-Business Suite (EBS) 12.1.1 or 12.2.2 is a critical data structure used primarily in the Oracle HRMS (Human Resource Management System) module for managing sequence ranges in distributed environments. This table plays a pivotal role in ensuring data integrity and uniqueness when generating identifiers for HR-related entities, particularly in multi-org or multi-instance deployments. Below is a detailed technical breakdown of its purpose, structure, and functionality.

Purpose and Context

The HR_DM_SEQUENCE_RANGES table is designed to support distributed HR operations by allocating unique numeric ranges to different instances or organizations. This prevents conflicts when generating sequential IDs (e.g., for employee numbers, assignment IDs, or other HR entities) across distributed systems. It is particularly useful in scenarios where multiple instances of Oracle HRMS share a common database or require synchronization.

Table Structure

The table typically includes the following key columns:
  • SEQUENCE_NAME: Identifies the type of sequence (e.g., 'PER_ASSIGNMENT_ID', 'PER_PERSON_ID').
  • RANGE_FROM: The starting value of the allocated numeric range.
  • RANGE_TO: The ending value of the allocated numeric range.
  • ORG_ID: The organization identifier to which the range is assigned (supports multi-org setups).
  • LAST_UPDATE_DATE and LAST_UPDATED_BY: Audit columns tracking modifications.
  • CREATION_DATE and CREATED_BY: Audit columns recording initial entries.

Functional Workflow

  1. Range Allocation: During system setup or synchronization, administrators define non-overlapping numeric ranges for each instance/org using this table. For example, Instance A may use 1-1000, while Instance B uses 1001-2000.
  2. ID Generation: When a new HR record is created, the system checks HR_DM_SEQUENCE_RANGES to determine the next available ID within the assigned range, ensuring uniqueness across distributed environments.
  3. Conflict Prevention: The table acts as a centralized control mechanism, preventing duplicate IDs even when multiple instances operate concurrently.

Integration with Oracle EBS Components

The table interacts with:
  • Oracle HRMS APIs: Used by HR APIs like PER_ALL_PEOPLE_F or PER_ALL_ASSIGNMENTS_F for ID generation.
  • Workflow Engine: Ensures seamless processing of HR transactions in distributed workflows.
  • Multi-Org Architecture: Aligns with Oracle's multi-org security model (ORG_ID filtering).

Technical Considerations

  • Performance: Indexes on SEQUENCE_NAME and ORG_ID are critical for efficient range lookups.
  • Customization While Oracle provides standard sequences, custom sequences may be added for extended HR functionalities.
  • Upgrades In EBS 12.2.2, the table may leverage Oracle RAC (Real Application Clusters) for high availability.

Best Practices

  • Regularly monitor range utilization to avoid exhaustion.
  • Implement a reconciliation process for range overlaps in complex deployments.
  • Document custom sequences added to the table for maintenance clarity.
In summary, HR_DM_SEQUENCE_RANGES is a foundational component for distributed HR operations in Oracle EBS, ensuring data uniqueness while supporting scalability and multi-org architectures. Its proper configuration is essential for large-scale or geographically dispersed HR implementations.