What are slowly changing dimensions?
- 5 Answers
- 31227 Views
- Informatica, Verinon Technology Solutions, I also Faced
- E-Mail Answers
Answer Posted / sri ram
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)
NOTE:
History means the slight change in the data stored and
incoming data but it doesn't means years of data.
| Is This Answer Correct ? | 36 Yes | 5 No |
Post New Answer View All Answers
What is dimensional table? Explain the different dimensions.
can anybody send me some real time screenshots of mapping in informatica powercenter. i will be vary thankful to him. my e-mail id :- prakashkumar.kumhar@gmail.com
Write the unconnected lookup syntax and how to return more than one column.
Tell me about your experience in informatica? what is best mark you can give yourself? How to answer this question?
Explain in detail about scd type 1 through mapping.
I have two different source structure tables, but I want to load into single target table? How do I go about it? Explain in detail through mapping flow.
What is dimensional table?
Write the unconnected lookup syntax?
Hi all , I am planning for informatica S - PowerCenter 8 Mapping Design certification. I have rewuired the dumps for the same. if anyone of you having the same pl. share it with me. This will be of great help. My contact is : sagardev7@gmail.com TIA , Sagar
draw informatica architecture 8.6 ?
Name at least 5 different types of transformations used in mapping design and state the use of each.?
How to create the source and target database connections in server manager?
Explain scd type 3 through mapping.
How do you load first and last records into target table? How many ways are there to do it? Explain through mapping flows.
How do you remove duplicate records in informatica? And how many ways are there to do it?
