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 DataStage  |  Question 288 of 377    Print  
What is the difference betwen Merge Stage and Lookup Stage?

  
Total Answers and Comments: 2 Last Update: January 29, 2007     Asked by: Ram 
  
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January 10, 2007 23:07:02   #1  
       
RE: What is the difference betwen Merge Stage and Look...

Merge stage : The parallel job stage that combines data sets

lookup stage: The mainframe processing jobs and parallel active stages that perfom table lookups.


 
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January 29, 2007 11:11:06   #2  
srinivasguptha Member Since: January 2007   Contribution: 2    
RE: What is the difference betwen Merge Stage and Look...
Lookup stage:1. Used to perform lookups.2. Multiple reference links, single input link, single output link, single rejects link, single primary link. 3. Large amount of memory usage. Because paging required5. Data on input links or reference links need NOT to be sorted. Merge stage:1. Combines the sorted data sets with the update datasets. 2. Several reject links, multiple output links will be exist. 3. Less memory usage.4. Data need to be sorted.
 
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What is the order of execution done internally in the transformer with the stage editor having input links on the lft hand side and output links?
Either used Copy command as a Before-job subroutine if the metadata of the 2 files are same or created a job to concatenate the 2 files into one if the metadata is different. 
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