in which situations do u go for scds ?

Question Posted / chandra1983

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in which situations do u go for scds ?..

Answer / purva

Slowly changing dimensions are dimension tables that have
slowly increasing dimension data, as well as updates to
existing dimensions.
Ex : if a person Mr. x is living in the city C1 has a
transaction in a bank and his details is maintained and
after some years he moves to city C4, that means he has his
new details develped but the bank need to maintain the
details i.e both c1 and c2 details ,the history has to be
maintained fully or sometimes partially , so in this cases
the necessity of SCD is required

When updating existing dimensions, you decide whether to
keep all historical dimension data, no historical data, or
just the current and previous versions of dimension data.

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in which situations do u go for scds ?..

Answer / murali

Mr.Chandra,
SCD's are the essential mappings we need to useto maintain
Datawarehouses. Coz,if we are serving our clients with
maintainance, we ought to update their data with necessary
changes. the changes can be,
1. Inserting the data from the latest OLTP database
2. Updating our OLAP DWH with changes.
3. Maintaing the change, as well as Historical data etc...

All these, can be done using SCD's only...

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in which situations do u go for scds ?..

Answer / rajan raorane

SCDs are basically used to updates in existing data or to
maintain history Data along with existing one

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