DRAFT ETL+ Load Replace Example 2 - Primary Key Prevents Duplicates?
Examples of source data and the target tables that result from a Load Replace.
Key point: The so called DW PK column in the Design page does not put a PK in the target table!
Example Configurations
Load Replace requires that at least one column be designated as a DW PK on the Design page.
Initial Load
Source file
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Target Table After
new Target Table
Log: (4 rows loaded)
2nd Load Replace
Source file
Target Table Before Load
Target Table After Load
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Log: (2 rows replaced)
The result above – 2 rows with the same PK – would not be allowed if the ETL+ created the target table with the PK as designated on the Design page.