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The EGO_OBJECT_LOCK table in Oracle E-Business Suite (EBS) versions 12.1.1 and 12.2.2 is a critical metadata table within the Engineering (ENG) and Product Lifecycle Management (PLM) modules. It primarily serves as a locking mechanism to prevent concurrent modifications to engineering or item-related objects, ensuring data integrity during transactional operations. This table is part of the Engineering Foundation (EGO) schema, which underpins the Engineering and Product Lifecycle Management functionalities in Oracle EBS.

Purpose and Functionality

The EGO_OBJECT_LOCK table is designed to manage object-level locks for engineering items, change orders, and other PLM-related entities. When a user initiates an edit or update operation on an object, the system places a lock entry in this table to prevent other users from simultaneously modifying the same record. This is particularly important in collaborative environments where multiple stakeholders may interact with the same data. The table stores details such as the locked object's identifier, lock type, lock owner (user or process), and timestamp information.

Key Columns and Structure

The table typically includes the following columns:
  • OBJECT_ID: The unique identifier of the locked object (e.g., item_id, change_order_id).
  • OBJECT_TYPE: Specifies the type of object being locked (e.g., 'ITEM', 'CHANGE_ORDER').
  • LOCK_TYPE: Indicates the lock mode (e.g., 'EXCLUSIVE', 'SHARED').
  • LOCKED_BY: The user or process that acquired the lock (usually maps to FND_USER.USER_ID).
  • LOCK_DATE: Timestamp when the lock was acquired.
  • EXPIRATION_DATE: Optional field indicating when the lock will automatically expire.

Integration with EBS Workflows

In Oracle EBS 12.1.1 and 12.2.2, the EGO_OBJECT_LOCK table integrates with:
  1. Engineering Change Management (ECM): Ensures only one user can modify a change order at a time.
  2. Item Master Maintenance: Prevents conflicting updates to item attributes.
  3. Workflow Processes: Maintains data consistency during approval workflows.

Administration and Troubleshooting

System administrators may need to query this table to:
  • Identify orphaned locks (e.g., from terminated sessions)
  • Force-unlock objects during maintenance
  • Diagnose "object locked" errors reported by users
Common SQL queries include checking active locks or identifying long-held locks that may indicate system issues.

Technical Considerations

In EBS 12.2.2, the table may have additional optimizations for cloud deployments, including:
  • Enhanced indexing for faster lock validation
  • Integration with WebLogic session management
  • Automatic cleanup routines for expired locks

Best Practices

  1. Implement scheduled jobs to purge stale locks older than 24 hours
  2. Monitor lock contention during peak usage periods
  3. Educate users about proper lock release procedures
The EGO_OBJECT_LOCK table exemplifies Oracle's approach to concurrent data management in complex ERP environments, balancing user collaboration with data consistency requirements.