INTERVIEW QUESTIONS DATA WAREHOUSING ABINITIO DETAILS

Question: How would you do performance tuning for already built graph ? Can you let me know some examples?

Answer: example :- suppose sort is used in fornt of merge component its no use of using sort ! bcz we hv sort component built in merge.

2) we use lookup instead of JOIN,Merge Componenet.

3) suppose we wnt to join the data comming from 2 files and we dnt wnt dupliates we will use union funtion instead of adding addtional component for duplicate remover.

example :- suppose sort is used in fornt of merge component its no use of using sort ! bcz we hv sort component built in merge.

2) we use lookup instead of JOIN,Merge Componenet.

3) suppose we wnt to join the data comming from 2 files and we dnt wnt dupliates we will use union funtion instead of adding addtional component for duplicate remover.

Source: CoolInterview.com

1> The space utilization by the Sort component at each phase should be optimum.

2> insteade of filter by expression we can use partition by expression component.

3> To know the data volume for each flow we can select driving port for a join component.

4> In memory join can be used for join based on the data volume. Source: CoolInterview.com

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