INTERVIEW QUESTIONS DATA WAREHOUSING INFORMATICA DETAILS

Question: Differences between connected and unconnected lookup?

Answer: Connected lookup:-
1> Receives input values diectly from the pipe line.
2> You can use a dynamic or static cache.
3> Cache includes all lookup columns used in the maping.
4> Support user defined default values.

Unconnected lookup:-
1> Receives input values from the result of a lkp expression in a another transformation.
2> You can use a static cache.
3> Cache includes all lookup out put ports in the lookup condition and the lookup/return port.
4> Does not support user defiend default values.

Connected lookup:-
1> Receives input values diectly from the pipe line.
2> You can use a dynamic or static cache.
3> Cache includes all lookup columns used in the maping.
4> Support user defined default values.

Unconnected lookup:-
1> Receives input values from the result of a lkp expression in a another transformation.
2> You can use a static cache.
3> Cache includes all lookup out put ports in the lookup condition and the lookup/return port.
4> Does not support user defiend default values.

Source: CoolInterview.com

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