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In Oracle E-Business Suite (EBS) 12.1.1 and 12.2.2, the deepseekAPPS.FND_STATS package plays a critical role in gathering and maintaining optimizer statistics for schema objects, ensuring optimal SQL execution plans. A key dependency of this package is on DBA_EXTERNAL_TABLES, a data dictionary view that provides metadata about external tables defined in the database. Understanding this dependency is essential for EBS administrators and developers, particularly when troubleshooting performance issues or configuring statistics gathering processes.

Overview of FND_STATS and DBA_EXTERNAL_TABLES

The FND_STATS package is part of the Oracle Applications Technology Layer (ATL) and is responsible for automating statistics collection for EBS schemas, including APPS, GL, AR, and others. It leverages Oracle's DBMS_STATS internally but extends functionality with EBS-specific optimizations. Meanwhile, DBA_EXTERNAL_TABLES is a dynamic performance view that lists all external tables accessible to the current user, including their defining attributes such as directory objects, access parameters, and file formats.

Dependency Analysis

The dependency between FND_STATS and DBA_EXTERNAL_TABLES arises in scenarios where EBS modules utilize external tables for data integration or reporting. Key aspects of this relationship include:
  1. Statistics Gathering Exclusion Logic: FND_STATS queries DBA_EXTERNAL_TABLES to identify external tables that should be excluded from statistics collection. Since external tables reference flat files rather than stored data, gathering statistics on them is unnecessary and could cause performance overhead.
  2. Schema-Level Processing: During schema-wide statistics gathering (e.g., via FND_STATS.GATHER_SCHEMA_STATISTICS), the package dynamically filters out external tables by joining with DBA_EXTERNAL_TABLES to avoid processing them.
  3. Partitioned External Tables: In EBS 12.2.2, where partitioned external tables might be used for large-scale data loads, FND_STATS validates their metadata against DBA_EXTERNAL_TABLES to ensure proper handling.

Technical Implementation

The dependency manifests in SQL queries embedded within FND_STATS procedures. For example: 
SELECT table_name 
FROM dba_external_tables 
WHERE owner = :p_schema;
This query helps FND_STATS build an exclusion list. The package also checks DBA_EXTERNAL_TABLES for properties like DEFAULT_DIRECTORY_OWNER and REJECT_LIMIT to determine if special handling is required.

Impact on EBS Operations

  1. Performance: The dependency adds minimal overhead during statistics gathering, as the view is memory-resident.
  2. Security: FND_STATS requires SELECT privilege on DBA_EXTERNAL_TABLES, typically granted via the SELECT_CATALOG_ROLE.
  3. Customizations: If custom external tables are added to EBS, they are automatically excluded from statistics collection due to this dependency.

Version-Specific Considerations

  • EBS 12.1.1: The dependency is straightforward, with basic filtering logic.
  • EBS 12.2.2: Enhanced to handle Oracle Database 12c features like in-memory external tables.

Troubleshooting

Common issues include:
  • ORA-00942 errors if DBA_EXTERNAL_TABLES access is revoked.
  • Performance degradation if the view contains thousands of entries.
  • Incorrect statistics if external tables are erroneously included due to view corruption.
In summary, the deepseekAPPS.FND_STATS package's dependency on DBA_EXTERNAL_TABLES is a deliberate design choice to optimize statistics gathering in Oracle EBS environments. It ensures external tables—which don't benefit from statistics—are efficiently excluded while maintaining the integrity of the statistics collection process.