We’re migrating legacy distribution data into Blue Yonder Luminate 2022.2 and hitting a wall with duplicate surrogate keys. Our ETL process pulls from three legacy systems (SAP, Oracle WMS, custom DB) and loads into staging tables. The bulk transfer job crashes with constraint violations:
ERROR: duplicate key value violates unique constraint "dist_center_pkey"
DETAIL: Key (dc_id)=(DC-5001) already exists
STATEMENT: INSERT INTO dist_centers VALUES...
The staging validation doesn’t catch these duplicates before the bulk load runs. We’ve tried deduplicating in the source query, but cross-system records have subtle differences (DC-5001 vs dc-5001 vs DC_5001) that our UPPER() approach misses. This is blocking our go-live for 12 distribution centers. Has anyone implemented proper deduplication logic for multi-source legacy imports? What’s the best approach for constraint violation handling during staging?
What’s your current staging table structure? Are you using temporary staging tables with relaxed constraints or direct loads? We found that using intermediate staging tables without PK constraints, then running deduplication queries with ROW_NUMBER() OVER (PARTITION BY normalized_key ORDER BY source_priority) helped tremendously. This lets you choose which source system wins when duplicates exist.
Don’t forget to implement proper constraint violation handling with detailed logging. When a duplicate is detected, your ETL should capture the conflicting records, log them to an exception table, and continue processing rather than failing the entire batch. This gives you visibility into patterns and helps refine your deduplication rules iteratively.
I’ve seen this exact issue. The problem is your deduplication is happening too late in the pipeline. You need to normalize the keys during extraction, not at staging. Create a mapping table that standardizes all variants (DC-5001, dc-5001, DC_5001) to a single canonical format before the data even touches your staging environment.
We’re using direct staging tables with constraints enabled, which is probably part of the problem. The intermediate staging approach sounds promising. How do you handle the source priority logic? Do you assign weights to each legacy system?