Friday, December 7, 2007

Data Warehouse Interview-2

What is snapshot? You can disconnect the report from the catalog to which it is attached by saving the report with a snapshot of the data. However, you must reconnect to the catalog if you want to refresh the data.

What is the difference between datawarehouse and BI? Simply speaking, BI is the capability of analyzing the data of a datawarehouse in advantage of that business. A BI tool analyzes the data of a datawarehouse and to come into some business decision depending on the result of the analysis.

What are non-additive facts in detail? A fact may be measure, metric or a dollar value. Measure and metric are non additive facts.

Dollar value is additive fact. If we want to find out the amount for a particular place for a particular period of time, we can add the dollar amounts and come up with the total amount.

A non additive fact, for eg measure height(s) for ‘citizens by geographical location’ , when we rollup ‘city’ data to ’state’ level data we should not add heights of the citizens rather we may want to use it to derive ‘count’

What is snapshot? You can disconnect the report from the catalog to which it is attached by saving the report with a snapshot of the data. However, you must reconnect to the catalog if you want to refresh the data.

What is the difference between datawarehouse and BI? Simply speaking, BI is the capability of analyzing the data of a datawarehouse in advantage of that business. A BI tool analyzes the data of a datawarehouse and to come into some business decision depending on the result of the analysis.

What are non-additive facts in detail? A fact may be measure, metric or a dollar value. Measure and metric are non additive facts.

Dollar value is additive fact. If we want to find out the amount for a particular place for a particular period of time, we can add the dollar amounts and come up with the total amount.

A non additive fact, for eg measure height(s) for ‘citizens by geographical location’ , when we rollup ‘city’ data to ’state’ level data we should not add heights of the citizens rather we may want to use it to derive ‘count’

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