Answer / g.v.subramanyam

data warehouse is used for to store the large volumes of
data.it can be used for future forecasting.it is the
collection of key pieces of information that can be used for
to take the dession by the managers.

Answer / handy

The main aim of data warehouse is in analyzing the large
volumes of data so that it can be helpful in taking business
decisions

Answer / vams_gk

for reporting one day details also enough.but analysis
means we need comparision means we need some old data is
called historical data.the data ware house saves historical
data ,we con't to any data base manuplations.


where is in normal databases we arte able to maintain some
extent of data .after that for entering new data u need to
delete the old data.

BUT in Data ware house u are able to stote years of records
no need to delete the old data

Answer / nameer

Datawarehouse(OLAP):
To store historical or years of data, we use datawarehouse.
So it will be usefull for managerial people to analyse
theire current scenario with old one and take some usefull
decision in the future to improve their business.
We load the data into datawarehouse using some ETL tool
which is called datawarehousing where as in normal database
we use insert operation. in datawarehouse no delete,update
or insert operation is used. Only select operation is used.
It uses the dimensional modelling(star or snowflake) schema
which will speed up the retrieval of data comapred to
ordinary database.

Can you please send me the migration related issues .

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