INTERVIEW QUESTIONS DATA WAREHOUSING DATASTAGE DETAILS

Question: How to implement type2 slowly changing dimensions in data stage?explain with example?

Answer: We can handle SCD in the following ways

Type 1: Just use, “Insert rows Else Update rows”

Or

“Update rows Else Insert rows”, in update action of target

Type 2: Use the steps as follows

a) U have use one hash file to Look-Up the target

b) Take 3 instances of target

c) Give different conditions depending on the process

d) Give different update actions in target

e) Use system variables like Sysdate and Null.

We can handle SCD in the following ways

Type 1: Just use, “Insert rows Else Update rows”

Or

“Update rows Else Insert rows”, in update action of target

Type 2: Use the steps as follows

a) U have use one hash file to Look-Up the target

b) Take 3 instances of target

c) Give different conditions depending on the process

d) Give different update actions in target

e) Use system variables like Sysdate and Null.


Source: CoolInterview.com

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