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Overview
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Overview

The HXC_LOCKS table is a core data object within the Oracle E-Business Suite (EBS) Time and Labor Engine (HXC). Its primary function is to manage concurrency control for timecard data, specifically time building blocks. It acts as a locking mechanism to prevent multiple users or processes from simultaneously editing the same time entry, thereby ensuring data integrity and preventing conflicts. When a user or a batch process begins modifying a time building block, a corresponding lock record is typically created in this table. This lock is held until the transaction is completed and committed, after which the lock should be released. The table is essential for the stable operation of the Time and Labor module, particularly in environments with high concurrent user activity.

Key Information Stored

While the provided ETRM metadata does not list specific columns, the foreign key relationships and the table's purpose define its critical data elements. The table stores records that associate a specific lock instance with a time entry and defines the type of lock applied. Key columns inferred from the structure include a primary key identifier (likely LOCK_ID), a foreign key to HXC_TIME_BUILDING_BLOCKS.TIME_BUILDING_BLOCK_ID to identify the locked time entry, and its corresponding OBJECT_VERSION_NUMBER (OVN) for optimistic locking consistency. Crucially, it contains a foreign key to HXC_LOCKER_TYPES.LOCKER_TYPE_ID, which classifies the lock (e.g., user edit lock, approval lock, batch process lock). Additional columns likely store metadata such as the locking session identifier, user ID, and timestamp of when the lock was acquired.

Common Use Cases and Queries

The primary use case is troubleshooting timecard submission, approval, or batch processing errors related to locked data. Administrators may query this table to identify orphaned locks that were not properly released, which can block legitimate user actions. A common diagnostic query would join HXC_LOCKS to HXC_TIME_BUILDING_BLOCKS and FND_USER to see which users are holding locks on specific time entries.

  • Identifying Active Locks: SELECT htb.time_building_block_id, hl.locker_type_id, fu.user_name, hl.creation_date FROM hxc_locks hl, hxc_time_building_blocks htb, fnd_user fu WHERE hl.time_building_block_id = htb.time_building_block_id AND hl.created_by = fu.user_id;
  • Investigating Lock Conflicts: When a user receives a "record locked by another user" error, support personnel can query this table using the specific TIME_BUILDING_BLOCK_ID from the error to identify the blocking session or process.

Related Objects

HXC_LOCKS is centrally connected to other key Time and Labor tables, as indicated by its foreign keys.

  • HXC_TIME_BUILDING_BLOCKS: This is the primary related table. Every lock in HXC_LOCKS must reference a specific time entry (building block) in this table via TIME_BUILDING_BLOCK_ID and its OBJECT_VERSION_NUMBER.
  • HXC_LOCKER_TYPES: This table defines the valid types of locks (e.g., "USER", "BATCH") that can be applied. The LOCKER_TYPE_ID in HXC_LOCKS references this table to categorize the lock's purpose.
  • Timecard Processing APIs: Underlying PL/SQL APIs in the HXC package that create, submit, and approve timecards will internally interact with the HXC_LOCKS table to manage concurrency during these operations.