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Informatica union transformation
What is the practical use of a union transformation?


  
Total Answers and Comments: 2 Last Update: December 06, 2007     Asked by: malleka 
  
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Submitted by: ask_kaushik
 
That was the description....
practical use would be like : if you have 3 different sources which returns different number of records but with the same ports and datatypes, union transformation can be used to sum up these records and proceed to the next transformation as the same pipeline.

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hasim_geek
December 06, 2007 11:43:56   #1  
ask_kaushik Member Since: December 2007   Contribution: 5    
RE: Informatica union transformation

The Union transformation is a multiple input group transformation that you use to merge data from multiple pipelines or pipeline branches into one pipeline branch. It merges data from multiple sources similar to the UNION ALL SQL statement to combine the results from two or more SQL statements. Similar to the UNION ALL statement, the Union transformation does not remove duplicate rows.
The Integration Service processes all input groups in parallel. The Integration Service concurrently reads sources connected to the Union transformation, and pushes blocks of data into the input groups of the transformation. The Union transformation processes the blocks of data based on the order it receives the blocks from the Integration Service.
You can connect heterogeneous sources to a Union transformation. The Union transformation merges sources with matching ports and outputs the data from one output group with the same ports as the input groups.


 
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December 06, 2007 12:14:27   #2  
ask_kaushik Member Since: December 2007   Contribution: 5    
RE: Informatica union transformation
That was the description....
practical use would be like : if you have 3 different sources which returns different number of records but with the same ports and datatypes, union transformation can be used to sum up these records and proceed to the next transformation as the same pipeline.
 
Is this answer useful? Yes | NoAnswer is useful 1   Answer is not useful 0Overall Rating: +1    

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