why union transformation is active transformation?
Answer Posted / mahaboob basha
Hi,
the only condition for a transformation to bcum active is
row number changes.
Now the thing is how a row number can change. Then there are
2 conditions:
1. either the no of rows coming in and going out is diff.
eg: in case of filter we have the data like
id name dept row_num
1 aa 4 1
2 bb 3 2
3 cc 4 3
and we have a filter condition like dept=4 then the o/p wld
b like
id name dept row_num
1 aa 4 1
3 cc 4 2
So row num changed and it is an active transformation
2. or the order of the row changes
eg: when Union transformation pulls in data, suppose we have
2 sources
sources1:
id name dept row_num
1 aa 4 1
2 bb 3 2
3 cc 4 3
source2:
id name dept row_num
4 aaa 4 4
5 bbb 3 5
6 ccc 4 6
it never restricts the data from any source so the data can
come in any manner
id name dept row_num old row_num
1 aa 4 1 1
4 aaa 4 2 4
5 bbb 3 3 5
2 bb 3 4 2
3 cc 4 5 3
6 ccc 4 6 6
so the row_num are changing . Thus we say that union is an
active transformation
Is This Answer Correct ? | 12 Yes | 2 No |
Post New Answer View All Answers
Differentiate between source qualifier and filter transformation?
How to extract the informatica rejected data?
how can we find the bottle neck in SQL Query in SOURCE QUALIFIER, and how can we tune it..?
What are the new features of informatica 9.x at the developer level?
What are the new features of Power Center 5.0?
What is joiner transformation in informatica?
Workflow is long running due to long running sql query so when we refer the query plan it tells the issue is due to partition of the db table. How to handle this?
During the running session, output files are created by informatica server. Enlist few of them.
what is the hint? how to use it to reduce the query processing in program?
Which is the t/r that builts only single cache memory?
what is the -ve test case in your project.
What are mapplets?
Explain how to import oracle sequence into informatica?
Explain what are the different types of transformation available in informatica.
Please tell me which institute is the best to study Informatica and asp.net in chennai Also please send me the latest interview questions in asp.net,c# and sql server to my id ramtryin@gmail.com