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What are slowly changing dimensions?
 Question Submitted By :: Informatica
I also faced this Question!!     Answer Posted By  
# 1
Slowly Changing Dimensions:(SCD)
Over period of time, the value /data associated with
dimensions may change. To track the changes we record the
changes as per the requirement.
There are three types of SCD
SCD 1:No history is maintained. As and when data comes, the
data is entered.
SCD 2: History is maintained
SCD 3: Partial History is maintained.
We maintain history for some columns but not for all.
For example,I have 3 records in a dimension
I have made 1 insert and 1 update. Then if the requirement
is that dimension is to be maintained
In SCD 1 Then
Total number of records is 4 records(1 insert & 1 update)
In SCD 2 Then
Total number of records is 5 records(1 insert & 1 update)
In SCD 3 Then
Total number of records is 4 records(1 insert & 1 update)
History means the slight change in the data stored and
incoming data but it doesn't means years of data.
Is This Answer Correct ?    34 Yes 4 No
Sri Ram
# 2
Is This Answer Correct ?    25 Yes 2 No
Sandeep.t Nizamabad
# 3
scds are three types.
type1:it stores the current data.

type2:it stores the full historical data.

type3:it stores the current and previous data in the target...
Is This Answer Correct ?    10 Yes 0 No
# 4
SCD, is a technique used to store the historical value of
dimension attributes.

The values of dimensional attributes change as time goes by.
When these attribute values change, you can overwrite the
old values with the new ones, or you can
preserve the old value.

There are two methods of preserving the old attribute
values: you can store the old values as rows, or you can
store them as columns

three types of SCD:
SCD type 1 overwrites the old values of the attributes so
the old values are not kept.
Ex: In product dimension,we will use SCD type 1, meaning we
will overwrite the old attribute values.

SCD type 2 keeps the old values by creating a new row for
each change.
SCD type 3 keeps the old values by putting them in another
Is This Answer Correct ?    0 Yes 1 No
# 5
there are three types SCD:
type-1: in this we can over write original recourd with new
type-2: we can create new record
type-3: we can create new attribute
Is This Answer Correct ?    9 Yes 23 No

Other Informatica Interview Questions
  Question Asked @ Answers
From where we can start or use pmcmd?   2
how eliminate the duplicates in flat file with out using sorter ,aggregater Wipro 4
Suppose we have a (assume relational) source table Product_Id Month Sales 1 Jan x 1 Feb x . . . . . . 1 Dec x 2 Jan x 2 Feb x . . . . . . 2 Dec x 3 Jan x 3 Feb x . . . . . . 3 Dec x . . . . . . and so on. Assume that there could be any number of product keys and for each product key the sales figures (denoted by 'x' are stored for each of the 12 months from Jan to Dec). So we want the result in the target table in the following form. Product_id Jan Feb March.. Dec 1 x x x x 2 x x x x 3 x x x x . . So how will you design the ETL mapping for this case , explain in temrs of transformations. Accenture 5
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If you want to create indexes after the load process which transformation you choose? HCL 3
what is the difference between Informatica7.1 & informatica 8.1   4
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Hi i am new to Informatica. I have few question's in Informatica. Can any one respond, it will be appricaited. Q.Is Flat File Contains the Dynamic Cache?   5
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