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Trying to Understand Incremental Performance

So based on what I'm reading about TX, it seems to me that even if only say 5 records changed on a source file, TX loads the entire source table into a Raw table (all 40 gigs of it) and then finds the 5 records.

 

Is there a way to get it to just pull the 5 changed records into TX?  

My incremental executions seem to take about 50% of the time of a full execution even though there is little to no data change.

 

 

 

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